INTRODUCTION & OVERVIEW

Welcome to Life With a Guinea Pig

Guinea pigs (cavies) are social, intelligent herbivores with specialized nutritional, dental, gastrointestinal, and environmental needs. With attentive daily care and prompt veterinary treatment when illness appears, many guinea pigs live 5-7 years or longer.

This guide is designed as an owner-friendly reference for pups, adults, seniors, pregnant or nursing sows, and guinea pigs with special medical needs. Individual recommendations may differ based on age, body condition, medical history, housing, and veterinary findings.

Inside, you will find practical guidance on:

• Housing, bedding, temperature, and daily husbandry
• Social companionship, handling, enrichment, and behavior
• Hay, pellets, vegetables, vitamin C, water, and weight monitoring
• Grooming, nail care, coat care, feet, and dental health
• Preventive veterinary care and life-stage considerations
• Reproductive health, pregnancy risks, and sex separation
• Common illnesses, medication cautions, and emergency warning signs

Quick Care Snapshot

HOME SETUP & HUSBANDRY

A safe, spacious, dry, well-ventilated environment supports physical health, normal social behavior, and exercise. Guinea pigs should live indoors or in a similarly protected climate-controlled environment whenever possible.

1. Enclosure Size and Layout

Bigger is better. Guinea Lynx recommends a minimum of about 7 square feet for one guinea pig and additional space for each companion; in practice, providing substantially more space improves movement, enrichment, and the success of social pairings. Many commercial starter cages are too small for long-term housing.

• Use a solid floor. Wire-bottom flooring can injure feet and contribute to pododermatitis (bumblefoot).
• Provide at least one hide for each guinea pig, plus an extra hide when space permits. Choose hides with two exits for groups to reduce trapping or guarding.
• Create separate zones for hay/feeding, hiding/resting, and open running space.
• Avoid aquariums and deep plastic tubs with poor ventilation.
• Exercise wheels and exercise balls are not appropriate for guinea pigs and may cause injury.

2. Bedding and Cleaning

Spot-clean urine-soaked bedding and heavily soiled areas daily. Replace or launder the main bedding often enough that the enclosure stays dry and odor-controlled. Clean food bowls and water containers daily, and wash hides and toys regularly.

3. Temperature, Ventilation, and Location

A comfortable indoor range is approximately 65-75 F (18-24 C). Guinea pigs tolerate heat poorly, particularly if obese, pregnant, elderly, very young, or long-haired. Keep the enclosure out of direct sun, away from heating vents and drafts, and in a room where household activity is present without constant noise or disturbance.

4. New-Pet Quarantine

When introducing a new guinea pig to an established household, a 2-3 week quarantine in a separate room is a reasonable precaution, especially when the new animal comes from a pet store, shelter, breeder, or unknown medical background. Care for resident guinea pigs first, wash hands between groups, and obtain veterinary evaluation if the newcomer has sneezing, eye/nose discharge, itching, hair loss, diarrhea, or weight loss.

COMPANIONSHIP, HANDLING & ENRICHMENT

1. Social Needs

Guinea pigs are social herd animals. Most benefit from living with a compatible guinea pig rather than alone. Compatible pairs may include two females, two males, or a neutered male with one or more females. Personality, enclosure size, resources, and introduction technique all influence success.

• Do not house intact males and females together unless breeding is intentional and medically supervised.
• Provide duplicate food areas, water sources, and hides when competition is present.
• Normal dominance may include rumbling, chasing, mounting, and brief nose-offs.
• Separate immediately for true fighting that causes bites, bleeding, or a rolling “tornado” fight. Use a towel or barrier rather than bare hands.

2. Handling and Taming

Approach quietly and predictably. Guinea pigs may run when you reach into the enclosure even when they trust you; this is a prey response rather than a sign that they dislike handling.

1. Place one hand under the chest just behind the front legs.
2. Use the other hand to support the hindquarters and abdomen.
3. Hold the guinea pig securely against your body while keeping the spine supported.
4. For children, have them sit on the floor or a couch while an adult transfers the guinea pig to their lap.

Never lift a guinea pig by the scruff, limbs, or a single part of the body. Falls can cause fractures, spinal injury, or internal trauma.

3. Enrichment and Exercise

• Daily floor time or a safe exercise pen with traction and supervision
• Tunnels, cardboard boxes, paper bags with handles removed, and hideouts
• Hay stuffed into cardboard tubes that have been slit lengthwise for safety
• Foraging: scatter a portion of greens or pellets through clean hay
• Rearrange safe furnishings periodically while retaining familiar hiding places
• Avoid hamster balls, exercise wheels, steep ramps, and high platforms without safe edges

4. Normal Behaviors

NUTRITION - THE FOUNDATION OF HEALTH

Guinea pigs are obligate herbivores and hindgut fermenters. Their gastrointestinal tract and continuously growing teeth depend on a high-fiber diet. Abrupt diet changes, low fiber intake, or prolonged appetite loss can lead to dangerous gastrointestinal slowing and dysbiosis.

1. Grass Hay: Unlimited, Every Day

Offer unlimited high-quality grass hay at all times. Timothy, orchard grass, meadow hay, and other grass hays are appropriate for most adults. Hay should smell fresh and grassy, be dry and free of mold, and make up the largest part of the diet.

Growing guinea pigs under about 6 months of age, pregnant or nursing sows, and selected underweight or recovering patients may benefit from alfalfa or alfalfa-containing diets because of higher protein and calcium needs. For a typical healthy adult, routine alfalfa as the main hay is usually unnecessary and can add excess dietary calcium.

2. Guinea Pig Pellets

• Choose a plain, uniform, species-specific pellet fortified with vitamin C. Avoid colorful mixes, seeds, nuts, dried fruit, and sugary pieces.
• For many healthy adults, approximately 1/8 cup per guinea pig per day is a common starting point; some individuals need more or less based on age, size, body condition, and the product fed. Follow veterinary guidance and the manufacturer’s feeding information.
• Growing, pregnant, or lactating guinea pigs may require a higher-energy formulation and should be fed according to veterinary guidance.
• Buy pellets in quantities that can be used while fresh. Store sealed, cool, dry, and away from light because vitamin C degrades with storage.

3. Fresh Vegetables and Greens

Offer a daily variety of fresh, well-washed vegetables. A practical target for many adults is about 1 cup of mixed vegetables per guinea pig per day, divided into one or more feedings. Introduce new foods gradually over several days.

4. Vitamin C

Guinea pigs cannot manufacture vitamin C and require a reliable daily dietary source. Adult maintenance requirements are commonly cited around 10-25 mg/kg/day; growing, pregnant, lactating, ill, or stressed guinea pigs may require 30 mg/kg/day or more. Bell pepper and other vitamin C-rich vegetables are useful food sources. Oxbow Natural Science Vitamin C Support treats/chews are another convenient supplemental source of stabilized vitamin C and may be used according to the manufacturer's directions and your veterinarian's recommendations. A plain oral vitamin C supplement may also be recommended when intake is uncertain or needs are increased. Vitamin C supplements should complement, not replace, unlimited grass hay and a balanced guinea pig diet.

5. Water

Fresh water should be available at all times. Bottles are common, but some guinea pigs drink well from heavy bowls. Check bottles every day for leaks, blockage, or a stuck ball valve. In groups, providing more than one water source can reduce competition.

6. Foods and Supplements to Avoid

• Rabbit pellets as a primary diet (not formulated for guinea pig vitamin C needs)
• Seed, nut, dried-fruit, yogurt-drop, or sugary treat mixes
• Routine multivitamins unless specifically prescribed
• Sudden large diet changes
• Human snack foods, dairy, meat, and high-sugar treats
• Unverified herbal or “natural” remedies; some plants and essential oils are toxic or irritating

WEIGHT, BODY CONDITION & DAILY MONITORING

Because guinea pigs often conceal illness, objective monitoring is one of the most useful things an owner can do at home.

1. Weekly Weighing

Use a digital kitchen scale that reads in grams. Weigh each guinea pig at least weekly at approximately the same time of day and keep a written or electronic record. During illness, recovery, advanced age, or appetite concerns, your veterinarian may recommend daily weights.

2. Daily Five-Point Check

• Eating hay and vegetables normally
• Producing normal quantity and size of fecal pellets
• Bright, responsive behavior and normal posture
• Quiet breathing without discharge, clicking, wheezing, or increased effort
• Normal urine pattern without crying, straining, blood, sludge, or repeated small urinations

3. Feces and Cecotrophy

Guinea pigs normally produce firm fecal pellets and also consume nutrient-rich cecal material directly from the anus. This behavior is normal and important. Soft stool stuck to the rear end, true watery diarrhea, a marked decrease in feces, or very small/dry feces may indicate disease and deserves veterinary attention.

GROOMING & HYGIENE

1. Coat Care

Check the skin during grooming for dandruff, crusts, circular hair loss, lice/nits, scabs, wounds, or painful areas. Severe itching can be caused by mites and may look like seizure activity because the guinea pig reacts violently to touch or scratching.

2. Bathing

Routine bathing is usually unnecessary. Bathe only when the coat is soiled or for a veterinarian-directed medical reason. Use lukewarm water, a mild small-animal or veterinarian-approved shampoo, avoid the eyes and ears, rinse thoroughly, and dry completely in a warm draft-free area.

3. Nail Trimming

Check nails every 2-4 weeks. Many guinea pigs need trimming about monthly, while seniors or less active animals may need more frequent care. Use small nail clippers and trim only the clear tip ahead of the quick. If nails are dark or severely overgrown, ask the veterinary team to demonstrate a safe technique.

4. Grease Gland and Perineal Care

Some guinea pigs - particularly males - develop oily material over the grease gland near the rump. Clean only when buildup is excessive. Older or mobility-limited boars may also accumulate debris in the perineal sac and may need periodic veterinary or owner-assisted hygiene after instruction. Do not probe or clean aggressively.

5. Foot Care

Check the bottoms of the feet weekly. Redness, swelling, scabs, ulcers, or thick calluses may indicate pododermatitis. Risk rises with obesity, arthritis, wire or abrasive flooring, and wet/soiled bedding.

DENTAL HEALTH

All guinea pig teeth - incisors and cheek teeth - grow continuously. Normal chewing of grass hay and appropriate tooth-to-tooth contact are essential for wear. Dental disease is common and can be difficult to detect early.

1. Signs of Dental Disease

• Drooling or a wet chin/chest (“slobbers”)
• Dropping food, chewing slowly, or choosing only soft foods
• Reduced hay intake despite interest in vegetables
• Weight loss or smaller feces
• Long, uneven, broken, or suddenly overgrown incisors
• Eye or nasal discharge, facial swelling, jaw lumps, or bad odor
• Repeated mouth movements, pawing at the mouth, or difficulty swallowing

Normal-looking incisors do not rule out cheek-tooth disease. A complete dental evaluation may require sedation or anesthesia and skull imaging. Dental trimming should be performed by an experienced veterinarian; clipping teeth with nail trimmers is inappropriate and can fracture teeth.

2. Prevention

• Unlimited grass hay
• Appropriate vitamin C intake
• Regular weight monitoring
• Avoiding chronic cage-bar chewing and traumatic falls
• Prompt evaluation of reduced appetite or chewing changes

PREVENTIVE VETERINARY CARE

1. Choosing a Veterinarian

Establish care with a veterinarian who routinely treats guinea pigs or exotic companion mammals before an emergency occurs. A baseline examination is especially useful for new pets, seniors, and guinea pigs from unknown backgrounds.

2. Wellness Schedule

3. Vaccines and Parasite Prevention

There are no routine companion-animal vaccines recommended for pet guinea pigs in the United States. Routine monthly heartworm or flea/tick prevention is not standard. Parasite treatment should be based on exposure risk, examination, and veterinary diagnosis. Never apply dog or cat parasite products without confirming the exact product and dose are safe for guinea pigs.

4. Diagnostic Screening

Depending on age and clinical findings, your veterinarian may recommend fecal testing, skin testing, urinalysis, blood work, radiographs, ultrasound, or CT. Imaging is particularly valuable for dental disease, urinary stones, respiratory disease, and reproductive disorders.

5. Anesthesia and Surgery

Guinea pigs can undergo anesthesia and surgery safely when managed by an experienced team using appropriate monitoring, warming, pain control, and recovery support. Unlike dogs and cats, guinea pigs should generally not be fasted for routine anesthesia because they cannot vomit and prolonged fasting can worsen gastrointestinal motility. Follow the specific instructions of the treating veterinarian.

REPRODUCTIVE HEALTH & LIFE STAGES

1. Sexing and Early Separation

Guinea pigs mature remarkably early. Males may become fertile at about 3-4 weeks of age, and females can become pregnant at a similarly young age. Pups should be accurately sexed, and male pups are commonly separated from their mother and sisters by about 3 weeks of age to prevent unintended breeding.

2. Pregnancy Risks

Pregnancy and delivery can be dangerous for guinea pigs. Complications include pregnancy toxemia/ketosis, dystocia, uterine prolapse, stillbirth, hypocalcemia, and emergency cesarean delivery. Unplanned breeding should be prevented. A pregnant sow should be managed in consultation with an exotics veterinarian, with close attention to diet, body weight, hydration, and any change in appetite or activity.

3. Ovarian and Uterine Disease

Ovarian cysts are common in adult female guinea pigs. Possible signs include symmetrical hair loss over the flanks, crusty nipples, behavior changes, abdominal enlargement, reduced appetite, or discomfort. Uterine disease and reproductive tumors also occur. Diagnosis often uses imaging, and surgery may be recommended.

4. Spaying and Neutering

Routine elective sterilization is not performed as universally in guinea pigs as it is in dogs and cats. Neutering is commonly considered for a male who will live with females or when medically indicated. Spaying may be recommended for specific reproductive disease or in selected elective cases. Discuss benefits, risks, surgeon experience, and anesthesia with an exotics veterinarian.

5. Age-Pertinent Care

COMMON HEALTH CONCERNS

1. Appetite Loss and Gastrointestinal Stasis

A guinea pig that stops eating is not a “wait and see” patient. Pain, dental disease, infection, urinary disease, stress, inappropriate antibiotics, and many other illnesses can cause reduced intake. As fiber intake falls, gut motility slows and gas or dysbiosis may develop, creating a dangerous cycle.

2. Respiratory Disease

Sneezing alone can occur with dusty hay or bedding, but persistent sneezing, nasal or eye discharge, noisy breathing, increased respiratory effort, reduced appetite, or lethargy can indicate infection. Guinea pigs can develop serious bacterial pneumonia and may worsen rapidly.

3. Urinary Disease and Stones

Bladder sludge, cystitis, and urinary stones are common clinical concerns. Signs may include squeaking or straining to urinate, frequent small urinations, blood, a wet rear end, reduced appetite, or abdominal discomfort. A blocked urinary tract is an emergency. Do not attempt to treat suspected stones at home.

4. Skin Disease and Parasites

Mites, lice, fungal infection (ringworm), bacterial infection, barbering, and hormonal disease can all cause hair loss. Intense itching, scabs, pain when touched, or seizure-like reactions to scratching are strongly suggestive of severe mite disease and require veterinary treatment. Ringworm can spread to people, so use careful hygiene and seek veterinary guidance.

5. Pododermatitis (Bumblefoot)

Red, swollen, ulcerated footpads can become deeply infected and may involve bone. Prevention includes dry, clean bedding, solid flooring, healthy body condition, adequate vitamin C, and treatment of arthritis or mobility problems. Early cases are easier to manage than advanced disease.

6. Lumps and Masses

Abscesses, enlarged lymph nodes, cysts, mammary tumors, ovarian disease, and other tumors can cause lumps. Guinea pig abscesses often contain thick material and may require surgery rather than simple drainage. Any persistent or enlarging lump deserves examination.

MEDICATION SAFETY

Guinea pigs have a sensitive hindgut microbial population. Some medications that are routinely used in dogs, cats, or people can cause severe or fatal gastrointestinal dysbiosis in guinea pigs.

1. Antibiotics Require Veterinary Selection

Never give leftover antibiotics or over-the-counter antibiotics without specific instructions from a veterinarian experienced with guinea pigs. Oral penicillins such as amoxicillin/ampicillin and several other antibiotic classes can be particularly hazardous. Safe drug choice depends on the infection, route, dose, age, hydration, kidney/liver function, and individual patient.

• Report diarrhea, marked appetite loss, bloating, or lethargy immediately after starting any medication.
• Do not stop a prescribed medication without speaking with the veterinarian unless you are instructed to do so.
• Never use a dog/cat dose based on “guessing” from body weight. Guinea pig doses and formulations can differ greatly.
• Avoid human pain relievers such as acetaminophen, ibuprofen, naproxen, or aspirin unless a veterinarian specifically prescribes and doses a medication.

2. Supportive Feeding

Veterinarians may prescribe syringe-feeding of a high-fiber herbivore recovery formula when a guinea pig is not eating enough. This is medical support, not a substitute for diagnosing the cause of anorexia. If the abdomen is severely distended, the guinea pig cannot swallow normally, or an obstruction is suspected, obtain urgent veterinary advice before force-feeding.

WHEN TO CALL THE VETERINARIAN

Medical Emergencies - Seek Care Immediately

• Open-mouth breathing, severe respiratory distress, blue or very pale mucous membranes
• Collapse, inability to stand, unresponsiveness, or marked weakness
• No interest in food with reduced/absent feces, especially with pain or abdominal swelling
• Severe abdominal distension or suspected bloat
• Straining without passing urine, repeated painful urination, or suspected urinary obstruction
• Major bleeding, traumatic fall with inability to use a limb, or suspected spinal injury
• Seizure, severe head tilt with loss of balance, or sudden neurologic deficits
• Heat stroke signs: severe lethargy, drooling, rapid/labored breathing, collapse
• Pregnant sow with weakness, respiratory distress, prolonged straining, bleeding, or stalled labor

Prompt Visit - Do Not Delay

• Gradual or sudden weight loss
• Persistent sneezing, nasal discharge, eye discharge, or noisy breathing
• Drooling, chewing changes, dropping food, or overgrown/broken teeth
• Blood in urine, repeated urinary discomfort, or a persistently wet rear end
• Diarrhea, persistent soft stool, or fecal impaction
• Hair loss, crusts, severe itching, or painful skin
• Red/swollen feet, foot sores, limping, or reduced mobility
• New lump, abdominal enlargement, nipple changes, or symmetrical flank hair loss in a female
• Reduced grooming, unusual hiding, hunched posture, or a significant behavior change

TRAVEL, BOARDING & EMERGENCY PREPAREDNESS

1. Transport Carrier

• Use a secure hard-sided carrier with solid footing and absorbent bedding or fleece.
• Provide hay during transport. For longer trips, discuss water and vegetable strategies with your veterinarian.
• Secure the carrier with a seat belt or place it in a stable footwell; avoid direct sun and vehicle temperature extremes.
• Transport bonded companions together when medically appropriate, but separate if there is fighting or if the veterinarian requests isolation.

2. Boarding or Pet-Sitter Instructions

Leave written instructions covering feeding amounts, vegetable routine, water checks, cage cleaning, each guinea pig’s normal weight, medication technique, veterinary contact information, and emergency signs. Ask the caregiver to visually confirm that each individual guinea pig is eating; a dominant cage mate can make it difficult to notice when another stops eating.

3. Emergency Kit

• Carrier and clean towels/fleece
• Digital gram scale
• Veterinary contact numbers and nearest emergency clinic that sees exotics
• Current medication list and medical history
• Small supply of usual pellets/hay for unexpected travel
• Kwik Stop powder for minor nail bleeding
• Veterinarian-recommended recovery food and feeding syringes only if your veterinarian has shown you how and when to use them

OWNER CHECKLIST

Daily

• Unlimited fresh grass hay available
• Fresh water functioning and clean
• Measured pellets and daily vegetables offered
• Confirm each guinea pig is eating and passing feces
• Spot-clean wet/soiled bedding
• Observe breathing, posture, eyes/nose, urine, and activity

Weekly

• Weigh each guinea pig in grams and record the result
• Check feet, nails, skin, coat, and rear end
• Deep-clean or launder enclosure components as needed
• Check water bottles for leakage and sanitize bowls/bottles
• Refresh enrichment and inspect toys/hides for damage

Monthly / Periodically

• Trim nails as needed
• Review food freshness and pellet storage date
• Reassess body condition and mobility
• Inspect long-haired guinea pigs for mats and urine staining
• Review emergency contacts and medication expiration dates

At Least Annually

• Wellness exam with a guinea-pig-experienced veterinarian
• Dental and body-condition assessment
• Review diet, housing, social dynamics, and any chronic concerns

SELECTED REFERENCES & TRUSTED RESOURCES

This owner guide was developed using the structure and patient-education style of the Advanced Veterinary Medical Center Puppy Care Guide, supplemented with guinea-pig-specific medical and husbandry material and current veterinary references.

Questions or concerns?

Advanced Veterinary Medical Center
3550 San Pablo Dam Road, Suite E - Sobrante Plaza
El Sobrante, CA 94803
(510) 222-7387
AVMCVET2021@gmail.com