Guinea Pig Care FAQ: Quick Answers to the Most Common Owner Questions

A healthy adult guinea pig's diet should be built around unlimited grass hay such as timothy or orchard grass. Hay supports normal gut movement and helps wear down continuously growing teeth. Most vets also recommend a small daily portion of plain guinea pig pellets fortified with vitamin C plus a variety of fresh leafy greens.

Fresh vegetables should be offered daily, with vitamin-C-rich choices like bell pepper often included. Fruits and sugary treats should stay limited. Alfalfa is usually reserved for young, pregnant, or nursing guinea pigs because it is richer in calcium and calories than most healthy adults need.

A practical rule is to make hay the main food, vegetables the fresh daily add-on, and pellets the smaller measured portion. If you are unsure how much to feed your guinea pig based on age, weight, or medical history, ask your vet for a tailored plan.

Yes. Guinea pigs cannot make their own vitamin C, so they must get it from food or supplements every day. VCA notes that many guinea pigs need about 10-50 mg of vitamin C daily, depending on age, stress, pregnancy status, and health needs.

Low vitamin C can lead to scurvy, which may cause poor appetite, rough coat, pain, swollen joints, diarrhea, weakness, gum problems, and slower healing. Merck notes that deficiency signs can appear within about 2 weeks if vitamin C is not provided.

Pellets made for guinea pigs contain added vitamin C, but the vitamin becomes less reliable over time with heat, humidity, and storage. That is why many vets encourage a combination of fresh vegetables and, when needed, a direct oral supplement rather than relying on water additives.

Most guinea pigs are social and usually do better with a compatible guinea pig companion. They often rest together, groom each other, and show more normal social behavior when housed in pairs or stable groups.

That said, not every pairing works. Personality, sex, neuter status, space, and introduction style all matter. Guinea pigs that are crowded or poorly matched may fight, guard food, or become stressed.

If you are thinking about adding a second guinea pig, ask your vet or a knowledgeable rescue about safe introductions, quarantine, and housing setup. A bonded pair usually needs more space, more hideouts, and duplicate food and water stations.

Guinea pigs need more floor space than many pet-store cages provide. They do best in a large, well-ventilated enclosure with solid flooring, soft bedding or fleece, places to hide, and room to walk, stretch, and explore.

Wire-bottom cages are not appropriate because they can injure the feet and contribute to sores. Glass aquariums are also not ideal for most guinea pigs because ventilation is limited. PetMD notes that guinea pigs are prone to overheating and should be kept in a cool, draft-free area, ideally around 65-75 F, and not above 80 F.

Bigger is usually better, especially for pairs. If your guinea pig spends time outside the enclosure for supervised exercise, that helps, but it does not replace the need for a roomy home base.

Spot-clean the enclosure every day and fully refresh bedding on a regular schedule based on cage size, number of guinea pigs, and bedding type. Guinea pigs produce a lot of urine, and damp, dirty surfaces can irritate the skin and feet.

Daily cleaning should include removing wet bedding, soiled hay, and leftover fresh foods. Water bottles and bowls should be checked and cleaned often. A deeper clean usually involves replacing bedding, washing dishes and hideouts, and wiping down the enclosure.

If you notice a strong ammonia smell, damp fur, dirty feet, or redness on the bottoms of the feet, the setup may need more frequent cleaning or better absorbent bedding. Your vet can help if you are seeing recurring foot or skin problems.

Guinea pigs often hide illness, so subtle changes matter. Warning signs include eating less, smaller or fewer droppings, weight loss, noisy or fast breathing, crusty eyes or nose, diarrhea, drooling, trouble chewing, hunched posture, reluctance to move, or acting quieter than usual.

A guinea pig that stops eating is an emergency because the digestive tract can slow down quickly. Breathing trouble, collapse, severe diarrhea, or obvious pain also need urgent veterinary care.

Many pet parents find that weekly weight checks help catch problems early. If your guinea pig loses weight, even before obvious symptoms appear, schedule a visit with your vet.

Yes, though grooming needs vary by coat type. Short-haired guinea pigs usually need light brushing, while long-haired guinea pigs often need more frequent brushing to prevent mats, urine scald, and debris buildup.

Most guinea pigs also need regular nail trims. Overgrown nails can change how they stand and walk, which may contribute to discomfort or foot problems. Some guinea pigs, especially older pets, may also need help keeping the rear end clean.

Bathing is not routine for most guinea pigs. If your guinea pig has skin issues, greasy buildup, or a dirty rear end, ask your vet what cleaning approach is safest. Frequent bathing without a medical reason can dry the skin and add stress.

Most guinea pigs should have a wellness exam with your vet at least once a year. Seniors and guinea pigs with dental disease, bladder stones, skin disease, weight loss, or other chronic issues may need more frequent visits.

Routine veterinary care can include a physical exam, weight tracking, dental evaluation, discussion of diet and vitamin C intake, and review of housing and husbandry. Because guinea pigs can decline quickly, it is helpful to establish care with a vet who is comfortable treating small mammals before an emergency happens.

If your guinea pig is not eating, has diarrhea, is breathing hard, seems painful, or has blood in the urine, do not wait for the next wellness visit. See your vet immediately.