| Color Key | |
| Important key words or phrases. | |
| Important concepts or main ideas. | |
OCW Zoological Medicine 2008
Exotic Small Mammal Medicine (2009)
J. Mayer, DVM / G. Kaufman, DVM
Cummings School of Veterinary Medicine at Tufts University
1. Learning Objectives
This chapter will review the most common health issues associated with exotic small mammal companion animal species. In addition to the list below, color coded topics indicate the learning objectives that the student should become familiar with. Cases will be presented in class to illustrate these topics. Students should focus on the following:
Understand the management of dental malocclusion in the guinea pig and chinchilla
Know the importance of closing the inguinal ring in surgical castration of the male guinea pig and chinchilla
Know the antibiotics that are safe to use in the guinea pig, chinchilla, and hamster and why this is an important issue
-
Be familiar with the following diseases in the guinea pig
Vitamin C deficiency
Dystocia
Lymphadenitis
-
Be familiar with the following diseases of the pet rat
Mycoplasma
Mammary tumors
Chronic progressive nephropathy
Obesity
Be familiar with the zoonotic diseases associated with rodents
Gain an appreciation for the husbandry and health challenges associated with keeping unusual exotic mammal species such as hedgehogs and sugar gliders as pets.
1.1. Review and Resources
Please review relevant material from 1st year Comparative anatomy before attending these lectures. Additional material can be found in
A Colour Atlas of the Anatomy of Small Laboratory Animals: Rabbit Guinea Pig by Peter Popesko, et al. available in the Wildlife Library (not for circulation).
The ICE First Step Program on Exotic Small Mammal Medicine, developed by Theresa Lightfoot, is a great supplement to this syllabus.
1.2. 'Pocket Pets?'
A quote from David L. Graham, D.V.M. PhD.
"Now, ponder, please that thought of the Bard's 'what's in a name?' Like, for example, 'Pocket Pets'? In my humble opinion all veterinarians should abjure use of the term 'pocket pets. It is (at least to me and few colleagues) offensive and denigrating to the inherent uniqueness and dignity of those creatures that happen to be of such small size that they can fit into a pocket. The term suggests that such pets can be maintained in a more casual and less careful, less caring, and less thoughtful manner than is required for maintenance of other, more traditional companion animal species. Such creatures are of no lesser biological and moral consequence than are larger, more traditional pets. I'm sure that the cute alliteration of the term is a major reason for its acceptance, but I urge that some other rubric(s) be coined under which to group these relatively diminutive companion animals. Please, they are sugar gliders, gerbils, hedgehogs, mice ('wee sleekit beasties' - R. Burns), small pets, little small animals (to differentiate them from dogs and cats which are merely 'small animals'), minipets ...but please...not 'pocket pets.'"
References and Resources |
Conservation Medicine Challenges |
Supplemental Readings |
1, 2, 3 |
2. Rodents - Introduction
2.1. Taxonomy (abbreviated list)
Order Rodentia | ||
Suborder Sciurognathi |
Family Sciuridae |
squirrels, marmots, chipmunks, gophers, beavers, kangaroo rats, springhaas |
Family Muridae |
rats, mice, hamsters, lemmings, voles |
|
Suborder Hystricognathi |
porcupines, cavies (guinea pigs), capybaras, chinchilllas, agoutis |
|
See also http://animaldiversity.ummz.umich.edu/site/accounts/classification/Rodentia.html#Rodentia
Free-ranging rodents are distributed worldwide and act as important members of the food chain. They also often act as vectors of disease.

Rodents seen most often in captive settings include:
Zoos - capybara, Patagonian cavy, agouti, prairie dogs, kangaroo rat, etc. guinea pigs, pacas (aguoti paca), hutias, tree porcupine, porcupines, woodchucks, naked mole-rats, degus, etc.
Pets - Norway rats, mice, guinea pigs, chinchillas, hamsters, gerbils, degus, prairie dogs
Research Laboratory - Norway rat (varieties), mice, guinea pigs, hamsters, etc.
Critically Endangered RODENTS from IUCN http://www.redlist.org/ | |||
Acomys cilicicus |
Gerbillus dalloni |
Leptomys elegans |
Oryzomys gorgasi |
Allactaga firouz |
Gerbillus floweri |
Leptomys signatus |
Pappogeomys neglectus |
Namdapha flying squirrel |
Gerbillus grobbeni |
Macrotarsomys ingens |
White-eared pocket mouse |
Short-tailed chinchilla |
Gerbillus hoogstraali |
Lesser small-toothed rat |
Pacific pocket mouse |
Mt. Isarog striped rat |
Gerbillus lowei |
Makalata occasius |
Perdido Key beach mouse |
Crateromys paulus |
Gerbillus mauritaniae |
Mallomys gunung |
Peromyscus pseudocrinitus |
Crunomys fallax |
Gerbillus occiduus |
Melomys rubicola |
Peromyscus slevini |
Dendromus vernayi |
Gerbillus quadrimaculatus |
Meriones chengi |
Pogonomelomys bruijni |
Dicrostonyx vinogradovi |
Gerbillus syrticus |
Cabrera's hutia |
Pseudohydromys murinus |
Morro Bay kangaroo rat |
Heteromys nelsoni |
Large-eared hutia |
Alice Springs mouse |
Giant kangaroo rat |
Hylopetes winstoni |
Dwarf hutia |
Pseudomys glaucus |
Dipodomys insularis |
Isolobodon portoricensis |
Little earth hutia |
Rattus enganus |
Dipodomys margaritae |
MacDonnel range rock-rat |
Microtus evoronensis |
Rattus montanus |
Fresno kangaroo rat |
Northern Idaho ground squirrel |
Microtus mujanensis |
Rhagomys rufescens |
Tipton kangaroo rat |
New Mexico least chipmunk |
Mus kasaicus |
Sicista armenica |
Gerbillus principulus |
Hidden Forest chipmunk |
Garrido's hutia |
Sigmodontomys aphrastus |
Eliurus penicillatus |
Mount Graham red squirrel |
Nectomys parvipes |
Tokudaia muenninki |
Gerbillus bilensis |
Cathlamet pocket gopher |
Orthogeomys cuniculus |
Tylomys bullaris |
Gerbillus burtoni |
Zyzomys palatilis |
Oryzomys galapagoensis |
Tylomys tumbalensis |
Gerbillus cosensis |
Leimacomys buettneri |
- |
Typhlomys chapensis |
2.2. Anatomical/Physiological features of note
-
Teeth
Rodents have open rooted incisors which are continually growing
Cavies, chinchillas, capybara also have open rooted molars
Sciuridae (squirrels), new world porcupines, rats and mice have closed molars (i.e. less likely to see molar malocclusion clinically)
Many rodents engage in coprophagy for dietary reasons
Select species of rodents hibernate
2.3. General Health Issues
2.3.1. Non-infectious diseases
Dental disease/malocclusion is seen especially in species with open rooted teeth
Woodchucks are reported to experience vascular dieseases of various types - arteriosclerosis, aortic rupture, cardiovascular and cerebrovascular disease etc.
Hypervitaminosis D is commonly reported in captive beaver, woodchucks, pacas and agoutis that are fed monkey chow
-
Urinary tract disease is reported in many rodents and includes
calculi
chronic interstitial nephritis
chronic progressive nephrosis (rats)
amyloidosis
nephrotic syndrome
urinary tract infections
Diabetes is seen in degus, ground squirrels, sand rats, spiny mice, chinese hamsters
2.3.2. Infectious diseases
-
Rabies is rarely reported, but possible (keep in mind ANY mammal can be infected with this virus!!)
Rabies virus infection in a pet guinea pig and seven pet rabbits. Eidson M, Matthews SD, Willsey AL, Cherry B, Rudd RJ, Trimarchi CV. J Am Vet Med Assoc. 2005 Sep 15;227(6):932-5, 918.
Rabies in two privately owned domestic rabbits. Karp BE, Ball NE, Scott CR, Walcoff JB. J Am Vet Med Assoc. 1999 Dec 15;215(12):1824-7, 1806.
Woodchuck is most commonly reported rodent in New England
A squirrel was found positive in 2004 in MA
It's assumed that most rodents die from the bite (exposure) before signs of rabies develop, or positive animals are rarely encountered (and thus reported) by humans
Hantavirus reservoirs
Encephalomyocarditis virus (rat as reservoir?)
Parvovirus reported in porcupines
Squirrel fibromatosis – pox virus in gray squirrels (Conservation dilemma in the UK: ProMEDmail 200550616.1693. http://www.promedmail.org)
Viral induced hepatitis/hepatocellular carcinoma - seen in captive woodchucks
Leptospirosis reservoirs (cotton rats, coypus, beavers, muskrats, woodchucks, voles, P. cavies, squirrels, deer mice), does not produce disease in the rodent but act as vectors for spread of the organism
Borreliosis reservoirs (mice)
Pseudotuberculosis Y. pseudotuberculosis, Y. enterocolitica (chinchillas, agoutis, beavers, lemmings, voles, mice, muskrats, coypus, prairie dogs, ground squirrels)
Yersinia pestis or plague (prairie dogs )
Tyzzers ds. occurs in many rodents
Fungal dermatitis
Aspergillosis (capybaras)
Parasites - variety of mites, tick, fleas, lice and fly larvae (myiasis, cuterebra), variety of helminths common, protozoa usually without disease, coccidia most likely to cause disease.

3. Guinea Pigs

Cavia porcellus
The guinea pig is an herbivorous rodent originating in South America. It was domesticated as early as 1000 BC.
Guinea pigs are still raised for food in South America, and used as pets and research animals around the world. A good resource on this topic is the book The Guinea Pig: Healing, Food, and Ritual in the Andes by Edmundo Morales and can be found at : http://www.amazon.com/Guinea-Pig-Healing-Ritual-Andes/dp/0816515581
3.1. Basic physiologic and anatomic parameters
LIFE SPAN |
4-8 yrs. |
HEART RATE |
230 - 380 bpm |
RESP RATE |
42 - 104 bpm |
RECTAL TEMP. |
98.8 - 103.1 (F) |
SEXUAL MATURITY |
3 mo.(M), 2 mo.(F) |
Guinea pigs have classic rodent dentition with two upper and lower incisors designed for gnawing and 1 premolar and 3 molar teeth on either side of the maxilla and mandible designed for grinding rough vegetation. All teeth are open rooted. Guinea pigs are monogastric hindgut fermenters like the rabbit.
Incisors 1/1
Canines 0/0
Premolars 1/1
Molars 3/3
Anatomic and physiologic peculiarities include:
no tail
only 2 inguinal nipples
large adrenal glands
very large vesicular accessory sex glands in the male
large open inguinal ring (testes can be completely retracted into abdominal cavity)
Kurloff bodies seen in some leucocytes on CBC
extended gestation period (59-72 days)
precocial young
yeast is normal GI flora (as is for rabbits)

3.2. Special considerations for husbandry and nutrition
Guinea pigs are easy to care for. They can be kept in open cages since they are poor climbers, but they can be good jumpers (esp. when scared). However they are the only mammal which will readily walk off the exam table, so never leave a guinea pig unattended on your exam room table.
Appropriate bedding materials are paper towels, plain newspaper or shredded paper. The more appealing cedar shavings should never be used for small animal bedding due to the potential hepatotoxicity from the phenol compounds in the shavings. Pine shavings have also been associated with increased respiratory disease and should be avoided if possible. Bedding must be changed frequently since urine buildup may produce ammonia toxicity with resultant increased susceptibility to respiratory infections or contribute to pododermatitis.
Guinea pigs are normally fed a diet including fresh good quality hay, Guinea pig pellets and fresh fruits and vegetables. Guinea pigs have an absolute dietary vitamin C requirement. Like some other New World animal species they are unable to make vitamin C. A deficiency will result in scurvy and eventual death from secondary complications.


(See Appropriate Care: A Basic Right for Guinea Pigs by Ruth Morgenegg, TB-Verlag, 2009, ISBN 978-3-9522661-3-7 and Appropriate Care: A Basic Right for All Rabbits by Ruth Morgenegg, TB-Verlag, 2009, ISBN 978-3-9522661-2-0 for additional information.)
Clinical signs of scurvy include a poor hair coat, anorexia, gingivitis, generalized pain, arthropathy especially at costochondral junctions, diarrhea, and respiratory infections. Vitamin C is normally added to all good quality guinea pig diets (pellets). Some owners will also supplement their pigs with fresh citrus fruit daily, or give OTC vitamin C supplements. Pelleted diets must be stored adequately (dry and cool, 22ºC, 72ºF) to preserve the vitamin content. 3 months after the date of manufacture, the vitamin C content cannot be guaranteed. Often times, the date of manufacture and the storage history prior to purchase of the pellets is unknown, allowing for problems to arise. Always supplement with vitamin C for any disease condition. Subclinical deficiency likely contributes to many disease states. Guinea pigs should not be fed rabbit pellets longterm because they do not have vitamin C added. Vitamin C administration in the drinking water is generally not recommended as this can change the taste of the water which will result in the animal not drinking. Direct supplementation via the food (as treat or supplement) is best.
Note that pathological conditions of an over supplementation of vitamin C have been published (see Kraus VB below).
Vitamin C Supplementation in the Guinea Pig |
|
800 mg/kg of pelleted diet (milled) OR 20 - 50 mg/guinea pig/day |
3.3. Basic diagnostic approaches
Blood collection in the guinea pig can be performed at various sites including the jugular (difficult), pre-caval vein (preferred at TCSVM Exotic Service), lateral saphenous vein and the cephalic vein.
Radiographs should not be performed with manual restraint only. Light sedation (see formulary) or full anesthesia is needed in order to take appropriate radiographs to be able to evaluate the full body (teeth to bladder).
Ketamine and diazepam or midazolam work well for sedation. Facemask induction with isoflurane or sevoflurane works very well and recovery is fast and smooth.
Oral examinations (malocclusion) may initially be performed with a nose speculum, but a complete examination must be performed under complete anesthesia.
3.4. Basic therapeutic approaches
Guinea pigs are even more sensitive and susceptible to antibiotic induced enterotoxemia than rabbits. Great care must be taken to choose appropriate antibiotics and use them only when necessary. The drugs listed as "safe" for rabbits are also safe in the guinea pig with the exception of injectable Pen G procaine (this drug can be fatal even as a s.c. injection). Guinea pigs are often infected with Gram (+) infections and selection of antibiotics should take this into account.
Oral medication is commonly prescribed for home use and is easy for the owner to administer (antibiotic precautions hold especially for oral meds). IM, SQ administration is similar to rabbits and other small mammals. IV access is challenging utilizing the saphenous or cephalic sites. IO catheters should be considered when appropriate.
Injectable vitamin C can be given to guinea pigs in the hospital setting. Vitamin C supplementation is recommended for all disease states to eliminate the possibility of subclinical deficiency.
3.5. Common problems/diseases
In the Guinea pig, noninfectious disease presentations are usually more common than infectious disease processes as a primary problem.
Scurvy (see above)
-
Cystic calculi/urolithiasis
Calcium usually involved
Surgical removal of urinary calculi not uncommon
Diabetes - similar to adult onset diabetes in humans
Gastrointestinal disorders
-
Molar malocclusion "slobbers"
Very common in chinchillas and guinea pigs
Most likely genetic or dietary cause (type of roughage being offered)
Clinical signs - anorexia, weight loss, appearing hungry but dropping food, salivation causing a moist chin (slobbers)
Tongue (lower arcade) or cheek (upper arcade) lacerations causing pain
Requires examination and regular trimming under general anesthesia (see end of chapter for special dental instrument pack) ; use of a dental bur is best method


Hepatic lipidosis due to fasting (often the onset of this metabolic problem arises within 24 hours)
-
Gastrointestinal ileus
Following fasting or anorexia
Following GI surgery
Challenging to return motility
Aggressive pain management is indicated in these cases
Cloacal impactions
-
Diarrhea (dietary, parasitic, bacterial)
Early dx. and aggressive supportive care needed
Life threatening enterotoxemia
Reproductive disorders
-
Dystocia
Ideally should breed before 7 mos. of age
Pubic symphysis calcifies after this age and large offspring cannot fit
may present as surgical emergency, however many older pigs readily give birth without complications, so rushing to a caesarean section is not necessarily indicated
if the time period between the delivery of 2 piglets is longer than 30 minutes a dystocia is most likely occurring
Pregnancy toxemia (relationship to obesity, fatty liver)
Cystic ovaries very common in older (>3 year old) females

Inguinal herniation following dystocia in a guinea pig
Dermatitis
-
Fungal (ringworm, yeast)
Trichophyton mentagrophytes
Microsporum canis
-
Mites
Cheyletiella
Trixacarus cavaie
Treat with Ivermectin
Lice
Fleas
Severe ectoparasitism can manifest in “seizure like episodes. Every guinea pig with CNS signs should be screened and treated for ectoparasites
Barbering
Pododermatitis

Viral diseases
Adenovirus
Cytomegalovirus (Herpes)
Lymphocytic choriomeningitis virus (LCM) - Guinea pigs not reported to transmit to people (see other rodents)
Parainfluenza virus
Retrovirus
Bacterial diseases
"Lumps" cervical lymphadenopathy (Streptococcus zooepidemicus, Streptobacillus moniliformis)
Pneumonia and rhinitis (Bordatella bronchiseptica, Streptococcus pneumoniae, others)
Conjunctivitis (above pathogens and Chlamydophila caviae)
Enterotoxemia
Tyzzer's disease
Pododermititis
Parasitic diseases
Ectoparasites (above)
Eimeria caviae
Cryptosporidium wrairi
Balisascaris procyonis
Encephalitozoon
Neoplastic diseases
Benign skin tumors
Fibrosarcoma
Lipomas
Mammary fibroadenoma or adenocarcinoma (common in the male guinea pig)
Leukemia/lymphosarcoma
3.6. Surgery and Anesthesia
In general guinea pigs make poor surgical candidates and anesthetic complications are common.
Sedation is often used for restraint or minor procedures in the guinea pig. Injectable anesthetics such as Ketamine, diazepam, xylazine are very effective. Major surgical procedures should be performed under inhalation anesthesia. Intubation is difficult in the guinea pig, except in the hands of experienced personnel. Therefore it is not recommended for the occasional surgery. In general, guinea pigs do very well with mask administration of isoflurane. Procedures such as neutering, caesarian section, tumor removal, etc. are usually safely carried out with mask anesthesia. An intravenous or intraosseous catheter and fluid support is highly recommended. Catheters can be placed in the saphenous or cephalic veins. Subcuticular closures without external skin sutures are recommended since guinea pigs like to chew their incisions.

Neutering is occasionally performed for birth control reasons. The inguinal ring in the guinea pig is very large. An open castration must include closure of the inguinal ring. A closed technique does not require the manipulation of the inguinal canal. Dystocias may also involve herniation into the inguinal ring. Caesarian section is probably the most common cause for emergency surgery in the guinea pig.
Gastrointestinal surgery is sometimes required for removal of foreign bodies such as trichobezoars. An enterotomy carries with it a very poor prognosis. The gut of the guinea pig does not tolerate much invasion and usually responds with an intractable ileus.
4. Chinchillas
4.1. Basic physiologic and anatomic parameters

The chinchilla is closely related to the Guinea Pig. They differ in that they are generally smaller in size, have a long furry tail, and live a lot longer. They were bred for their wonderful soft coats for the fur coat industry, but have since become very popular pets. All chinchillas in the US originated from a breeding colony of only 9 animals! They are currently protected as wild animals in their natural range in the Andes mountains.
LIFE SPAN |
8-20 yrs. |
HEART RATE |
180 - 380 bpm |
RESP RATE |
N/A |
RECTAL TEMP. |
96.8 - 100 (F) 36-38 (C) |
SEXUAL MATURITY |
3 mo. |
Chinchillas have an even longer gestation period than the guinea pig (111-128 days)
Very precocial young
They are nocturnal and like to burrow during the day.
They are very intolerant of hot weather (dangerous if ambient temperature is above 85 F or 30C).
4.2. Special considerations for husbandry and nutrition
Chinchillas are generally kept caged in a large enclosure in the house. They are very attracted to chewing electric cords and should not be left out unsupervised. They should have a place to burrow or hide in the cage. Unlike the guinea pig, chinchillas can jump and climb fairly well. Chinchillas must have a dust bath, preferably daily but limited to about 20 minutes. This consists of a bowl with a special mixture of silver sand and Fuller's earth (available at pet stores). The dust bath can be withheld or limited in situations with open wounds or conjunctivitis, etc. Prolonged exposure or ad lib exposure can result in problems such as conjunctivitis.
The chinchilla is normally fed chinchilla pellets, hay and a variety of fresh greens, nuts and fruits. They can also be fed rabbit pellets since they do not have a special requirement for Vitamin C. A 'poor' quality hay appears to be best for these animals as they need to chew fibers which are high in crude fiber and often highly lignified.
4.3. Basic diagnostic approaches
Venipuncture sites are as in the guinea pig.
Radiology is also very similar to the guinea pig.
Normal blood values are listed at the end of this chapter.

4.4. Basic therapeutic approaches
Chinchillas also have a very sensitive GI flora and are susceptible to enterotoxemia. They also suffer from Gram (+) infections. The same medications recommended for the rabbit and the guinea pig are recommended for the chinchilla.
4.5. Common problems/diseases

"Slobbers" molar malocclusion (more common than in the guinea pig)
Heat stroke (optimal ambient temperature 65-80ºF)
Electrocution
Thiamine deficiency (neurologic)
Dermatitis
Barbering
Fungal (Trichopyton mentagrophytes), yeast
Fur mites
Fur slip
Gastrointestinal disorders
Intestinal ileus
Constipation (dehydration)
Trichobezoar (hairball)
Intussusception
Mucoid enteritis, enterotoxemia
Bacterial enteritis
Protozoal enteritis (Giardia)
Bacterial disorders
Pneumonia
Salmonella enteritis
Listeria enteritis and encephalitis
Yersinia pseudotuberculosis (diarrhea, encephalitis)
Abscesses following fighting
Parasitic disorders
Ectoparasites (above)
Giardia
Cryptosporidia
Balisascaris procyonis
5. Hamsters
Syrian (golden) Mesocricetus auratus
Chinese (Siberian) Cricetus griseus
Armenian
European
Teddy Bear

Hamsters should be kept alone. Fighting is common. They are nocturnal and will hibernate at temperatures below 41ºF. They possess large bilateral flank scent glands that can become impacted. They are used extensively in research due to their immune system peculiarities (cheek pouches).
5.1. Common problems and diseases
Ammonia toxicity (poor cage hygiene), and phenol toxicity (cedar shavings)
-
Enterotoxemia :
most acutely sensitive of the rodents
Use only SAFE antibiotics as listed for rabbits and guinea pigs
-
Proliferative ileitis "wet tail" (Lawsonia intracellularis), often with prolapse
Aggressive supportive therapy (fluids)
Antibiotics (Enrofloxacin and Tetracyclines)
Tyzzer's disease (Cl. piliformes) - rare
Diabetes mellitus (hereditary)
Renal amyloidosis
Urolithiasis
Neoplasia, impaction of the flank glands
Lymphocytic choriomeningitis virus (LCM) ZOONOTIC mice are natural host
Tapeworms (hymenolepis nana) ZOONOTIC
Demodex
Lymphosarcoma - very common
-
Adrenocortical adenomas (Cushings, hairloss)
Lysodren therapy
Poor prognosis
Malnutrition (low protein) induced hairloss
Staph pyoderma
6. Gerbils
Gerbils are generally less aggressive and more compatible then hamsters. They are still best kept alone. They are hardier than hamsters. Gerbils have tails.
6.1. Common problems and diseases
Tyzzer's disease
Salmonellosis
Hymenolepis nana tapeworms
Demodex
Cystic ovaries
Multiple tumors (> 2years of age)
Hereditary epilepsy, precipitated by stress
7. Rats & Mice
7.1. Rats
Rattus norvegicus - laboratory rat (albino), hooded rat ("Long Evans stock") ... many strains!!

Rats are a surprisingly good companion animal: intelligent and responsive. However they have a short life span ( 2-3 years). Rats are omnivorous and have a tendency for obesity. Chromodacryorrhea can be very pronounced in the rat (red porphyrins in the urine and other glandular secretions such as tears and nasal discharge).
7.1.1. Common problems and diseases
Mycoplasma - pneumonia, reproductive disease, arthritis, encephalitis
Tyzzer's disease
Subcutaneous abscesses
Staph pyoderma
Ringworm - trichophyton spp.
Ammonia toxicity
Self-mutilation
Chronic progressive nephropathy (old age disease)
Obesity
Viral diseases
Parvovirus
Sialodacryoadenitis virus (coronavirus) - respiratory
Sendai virus (PI I virus, more important in mice) - respiratory
Bunya virus - Hanta virus
Parasitic diseases
Pinworms Syphacia muris
Aspicularis teraptera, another oxyurid
Tapeworms - Taenia taeniaformis (intermediate host for cat)
Hymenolepis nana ZOONOTIC
Mites (several species)
Fleas

Neoplasia
-
Mammary fibroadenoma
Both males and females
Grow rapidly!
Easily resected, but will recur if animal is not spayed (estrogen dependant tumor)
Mammary adenocarcinoma
Squamous cell carcinoma
Pituitary adenoma - very common
Uterine, ovarian and vaginal carcinomas
MANY strain specific tumors

7.2. Mice
Mice are rarely seen in small animal practice. They are extensively used in research and well understood from a laboratory animal perspective.

7.2.1. Common problems and diseases
Barbering
Neoplasia (variety)
Bacterial diseases
Tyzzer's disease (first described in mice!) - death, diarrhea
Salmonella
Streptococcus - respiratory
Mycoplasma - respiratory, encephalitis
Viral diseases
Mousepox
Cytomegalovirus (worse for young)
Lymphocytic choriomeningitis virus (arenavirus) - ZOONOTIC, neurologic, sudden death
Sendai virus - respiratory
Pneumonia virus of mice (Paramyxovirus)
MANY other viruses of importance to lab animal medicine
Parasitic diseases
Toxoplasmosis (intermediate host)
Pinworms Syphacia obvelata
Aspicularis teraptera, another oxyurid
Tapeworms - Taenia taeniaformis (intermediate host for cat)
Hymenolepis nana ZOONOTIC
Mites (several species)
Ringworm
8. Prairie Dogs
8.1. Basic data
Rodents in the Sciuridae family
Ethical issues surrounding management of wild populations and taking for pets
Not legal as pets in MA!
Legal in many states to take from wild; large export market to Japan
Black tailed prairie dog (Cynomys ludovicianus) being considered for protection
Utah prairie dog (Cynomys parvidens) listed as threatened
Mexican prairie dog (Cynomys mexicanus) listed as endangered
Dangers of Yersinia pestis
8.2. Care and husbandry tips
Do not keep in wire cages - dental injuries
Main diet of rodent block, grass hay
AVOID dog food or monkey chow, excessive Vitamin D
8.3. Health issues
Odontoma - very common cause of respiratory difficulties
Ectoparasites, fleas
Ringworm
Pasteurella abscesses
Pododermatitis
Yersinia pestis plague, high mortality, ZOONOTIC
Other zoonoses: Tuleremia, Monkey Pox
Dental disease
Obesity
Respiratory problems due to pasteurella, pulmonary mites, dental disease
Baylisascaris
Antibiotic choices as for rabbits and guinea pigs
For more information on prairie dogs see references
9. Hedgehogs
There currently exists a "fad" with captive bred African Pygmy or Central African hedgehogs (Atelerix albiventris). Other species (14) of hedgehog also occur in Africa, Europe and Asia. Much is written about the widely protected European hedgehog (Erinaceus europaeus), but little is known about the others.

9.1. Basic data
Weight 250 - 600g, live 5-10 years in captivity, 3-4 years in the wild
Rectal temp. 95.2ºF (35ºC)
Temperate climate, lots of cover, hibernate at low temperatures < 65ºF (<19ºC) - discourage in captivity
Solitary and nocturnal
Insectivores (with rare vegetation)
Roll up as a defensive reaction
"self-anointing" or "anting" behavior in response to foreign materials
Exquisite sense of smell

9.2. Husbandry
Need secure cage (can climb) with smooth walls and bottom
Clean frequently
Bedding of shredded newspaper
Hide box
Cover preferred
75-85F, will hibernate at low temps., suffer heat stress at higher temps.
Exercise/environmental enrichment important (special exercise wheel with solid running surface)
Keep solitary, rarely can be housed in compatible groups if cage is large enough

9.3. Diet
Natural diet of insects, crustaceans and vegetable matter.
-
Captive diet
Commercial diet (preferred) or dry cat food (high protein, low cal)
Worms, mealworms, crickets, etc.
Fruits and vegetables
Learn to drink from a sipper bottle
Prone to obesity

9.4. Restraint
Examination difficult: usually need drugs!
Isoflurane is recommended.
Use gloves for handling.
9.5. Health issues

Neoplasia very common - multiple organs: squamous cell carcinoma, mast cell, fibrosarcoma
Ectoparasites extremely common - mites, ticks and fleas
OK to use ivermectin (0.2 - 0.5 mg/kg) and pyrethrin based shampoos
Papillomas
Fungal dermititis, Trychophyton mentagrophytes var. echinacei
Bordetella and Pastuerella rhinitis and pneumonia
Salmonella, Yersinia pseudotuberculosis and GI infections
Abscesses (incl. mycobacterium)
Foot and mouth disease virus - oral lesions (native African animals only)
Obesity, hepatic lipidosis, skin fold dermatitis
Oral foreign bodies
Dental disease, tartar, gingivitis
Congestive heart failure/cardiomyopathy
Interstitial nephritis
-
Neurologic demyelinating disease ("Wobbly Hedgehog Disease")
Hedgehogs with this disorder walk in an uncoordinated way or show paresis or paralysis, but are usually in perfect mental status
Take care not to over diagnose this disease for sick hedgehogs that show generalized depression as a clinical sign of other diseases
10. Sugar Gliders
The sugar glider has recently become a popular exotic pet, available in many states, but still illegal in MA. It is a true marsupial in the possum family from Australia and New Guinea: Petaurus brevicepts. Animals available in the US are captive bred.
10.1. Basic data
Nocturnal
Marsupial reproduction
Social habits (6-10 in a group in the wild) DO NOT KEEP THEM ALONE
Patagium forms the gliding membrane as in a flying squirrel
Body weight 90-130 g., males > females
Cloacal temperature 90ºF (32ºC)
Life span 10-12 yrs. in captivity
10.2. Husbandry and nutrition
Need lots of space and lots of socialization/attention (min. cage 20"x20"x36")
Wire caging OK, with climbing structures and nest box or sleeping pouch high in cage
Ideal ambient temperature 75-80 F
-
Natural diet
Sap/gum from eucalyptus and acacia
Nectar/pollen, manna, honeydew
Insects and spiders
Variable with the season
-
Captive diet (beware of erroneous literature)
Nectar
Insects and other protein (eggs, pinkies, high quality cat food)
Limited fruits and vegetables
Commercial sugar glider diets
Vitamin and mineral supplement (esp. calcium)
10.3. Health issues
Malnutrition
Obesity
Metabolic bone disease -hypocalcemia may present as a true emergency
Dental disease; DO NOT trim incisors, these are not rodents!
-
Infectious diseases
Pasteurellosis
C. piliforme
Giardiasis
Cryptosporidiosis
Toxoplasmosis
Lymphoid neoplasias
-
Self mutilation, stress associated
Sugar gliders become very depressed when housed alone often resulting in self-mutilation
Being used as a model animal to study clinical depression
Trauma
11. References and Resources
Conservation Medicine Challenges |
Supplemental Readings |
1, 2, 3 |
11.1. Professional Organizations
Association of Exotic Mammal Veterinarians (AEMV) http://www.aemv.org/
11.2. Web sites
Hedgehog FAQ http://www.hedgehoghollow.com/faq/
International Sugar Glider Association http://www.isga.org/
Anatomy and species natural history: http://animaldiversity.ummz.umich.edu/site/index.html
Nutrition and feeds: http://www.exoticnutrition.com/
11.3. Products mentioned in the text
Special rabbit/rodent dental pack is available from: Spectrum 4575 Hudson Drive Stow, OH 44224 Phone 800-444-5644 Fax 330-686-4555 spectrumsurgical.com Rabbit Dental Pack order #54-800
11.4. Journals
Exotic DVM at http://www.exoticdvm.com (this journal is free for students)
Journal of Exotic Pet Medicine. official Journal of the Association of Exotic Mammal Veterinarians. New York : Elsevier/Saunders.
Veterinary Clinics of North America. Exotic Animal Practice. Philadelphia, PA : W.B. Saunders Co., 1998-
11.5. Articles and Texts
Abou-Madi, N. Anesthesia and analgesia of small mammals. In: Recent Advances in Veterinary Anesthesia and Analgesia: Companion Animals , Gleed R.D. and Ludders J.W. (Eds.). International Veterinary Information Service, Ithaca NY (www.ivis.org)
Bennett, R. Avery. Husbandry and medicine of hedgehogs. Proceedings of the Annual Convention and Expo of the Association of Avian Veterinarinas, 2000, pp. 109-114.
Bennett, R. Avery. Husbandry and medicine of prairie dogs. Proceedings of the Annual Convention and Expo of the Association of Avian Veterinarinas, 2000, pp. 79-83.
Booth, RJ. General husbandry and medical care of sugar gliders. IN Kirk's Current Veterinary Therapy XIII. Bonagura JD, ed. Philadelphia : W.B. Sauders, 2000, pp. 1157-1163.
Capello, Vittorio. Pet Hamster Medicine and Surgery - Part II: Clinical evaluation and therapeutics. Exotic DVM, v. 3.4, 2001: 33-39.
Capello, Vittorio. Dental diseases and surgical treatment in pet rodents. Exotic DVM, 5.3 July 2003: 21-27.
Childs, James E., et al. Surveillance and spatiotemporal associations of rabies in rodents and lagomorphs in the United States, 1985-1994. Journal of Wildlife Diseases, 33 (1), 1997, pp. 20-27.
Done LB, et al. Necropsy lesions by body systems in African hedgehogs (Atelerix albiventris): clues to clinical diagnosis. Proc Joint Meeting AAZV/AAWV 1992, pp. 110-112.
Fowler, Murray E. and Miller, R. Eric. Zoo and Wild Animal Medicine, 5th ed. Saunders, 2003. Chapters: 34, 35, 43.
Fudge, Alan M. Laboratory Medicine, Avian and Exotic Pets. Philadelphia : W.B. Saunders Co., 2000.
Quesenberry, Katherine E., James W. Carpenter, Peter Quesenberry. Ferrets, Rabbits and Rodents: Clinical Medicine and Surgery Includes Sugar Gliders and Hedgehogs. 2nd ed. Philadelphia: WB Saunders Co., c2003
Hoefer HL. Hedgehogs. Vet Clin of North America Small Animal Practice, vol. 24, 1994, pp. 113-120.
Isenbugel E., Baumgartener, RA. Disease of the hedgehog. In: Fowler, Murray E. Zoo and Wild Animal Medicine, Current Therapy 3. Philadelphia, WB Saunders, 1993, pp. 294-302.
Johnson-Delaney, Cathy A. Exotic Companion Medicine Handbook for Veterinarians. Wingers Pub. Inc., 1996.
Lightfoot, Teresa L. ICE First Step Program 2003
Kraus VB, Huebner JL, Stabler T, Flahiff CM, Setton LA, Fink C, Vilim V, Clark AG. Ascorbic acid increases the severity of spontaneous knee osteoarthritis in a guinea pig model. Arthritis Rheum. 2004 Jun;50(6):1822-31
Lightfoot, TL. Clinical examination of chinchillas, hedgehogs, prairies dogs, and sugar gliders. Vet Clinics of North America, Exotic Animal Practice, Vol. 2, 1999, pp. 447-469.
Morales, Edmundo. The Guinea Pig: Healing, Food, and Ritual in the Andes. University of Arizona Press, 1995.
Ness, Robert D. Sugar glider (Petaurus bevideps): general husbandry and medicine. Proceedings of the Annual Conference of the Association of Avian Veterinarians, 2000, pp. 99-107.
Palmer, AC, et al. Paralysis in hedgehogs (erinaceus europaeus) associated with demyelination. Vet Record, Vol 143, 1998, pp. 550-552.
Pye, GW, Carpenter JW. A guide to medicine and surgery in sugar gliders. Veterinary Medicine, 1999: 891-905.
Quesenberry, Katherine E., James W. Carpenter, Peter Quesenberry. Ferrets, Rabbits and Rodents: Clinical Medicine and Surgery Includes Sugar Gliders and Hedgehogs. 2nd ed. Philadelphia: WB Saunders Co., c2003
Raymond, James T., and M. R. White. Necropsy and histopathologic findings in 14 African Hedgehogs (Atelerix albiventris): a retrospective study. JZWM, v. 30 (2), 1999: 273-277.
Raymond, James T. and Michael M. Garner. Cardiomyopathy in captive African hedgehogs (Atelerix albiventris). Proceedings of the AAZV and IAAAM Joint Conference, 2000, p. 245.
Reeve H. Hedghogs. London, T & AD Poyser Ltd, 1994.
Smith, AJ. Husbandry and nutrition of hedgehogs. Vet Clinical of North American, Exotic Animal Practice, vol. 2, 1999, pp. 127-141.
Veterinary Clinics of North America. Exotic Animal Practice. Philadelphia, PA : W.B. Saunders Co., 1998-
Wheler, Colette L., Grahn, Bruce H., Pocknell, Ann M. Unilateral proptosis and orbital cellulitis in eight african hedgehogs (Atelerix albiventris). Journal of Zoo and Wildlife Medicine, v32, 2001: 236-241.
Wrobel D, Brown SA. The Hedgehog, an Owner's Guide to a Happy Healthy Pet. New York, Howell Book House, 1997.


