Cavia porcellus

Guinea Pig

Guinea pigs are chatty, gentle herd animals that thrive in company and need a much larger, flatter enclosure than pet-shop cages provide.

CaviidaeLifespan 5–8 yearsCare complexity 3/5Suitable for beginners

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At a glance

Scientific name: Cavia porcellus
Family: Caviidae
Origin: Domesticated in the Andes of South America
Lifespan: 5–8 years
Adult size: 20–30 cm
Weight: 700–1200 g
Temperament: Gentle, vocal and highly social
Activity level: Moderate, active in short bursts through the day
Social needs: Very high — keeping one alone is banned in some countries
Intelligence: Learns names, routines and simple targets
Noise: Very vocal, especially around feeding time

Housing and environment

Housing: Minimum 1.2 x 0.6 m for a pair, larger for trios, on one level with hiding places
Space requirement: Ground-level space matters more than height
Temperature: 18–24°C; sensitive to both heat and cold
Humidity: Moderate, dry bedding is essential
Exercise: Daily floor time in a safe enclosed area
Grooming: Weekly brushing; long-haired breeds need daily care and trimming

Life stages and changing needs

Expanded care guidance · Updated 7 October 2026 · Not professionally reviewed

Young animals and settling in

Young guinea pigs are born relatively developed but still need a calm, predator-free introduction and an established, compatible companion rather than solitary housing. Weigh regularly during the first weeks and confirm sex with a vet, since littermates can breed very young. Offer unlimited grass hay from the start alongside a measured portion of fortified pellets; sudden diet changes can unsettle their sensitive digestive system.

Adult care and reproductive changes

Adults need a spacious, permanent run-sized enclosure with a bonded pair or small group of the same sex, or a neutered male with females. Unplanned breeding is risky, since older first-time mothers can suffer fatal birthing complications from fused pelvic bones. Watch for bullying, barbering and resource guarding in groups, and separate animals if injuries appear rather than assuming hierarchy disputes resolve themselves.

Later life and changing needs

Older guinea pigs can develop arthritis, dental overgrowth and reduced mobility, so ramps, shallower steps and easier access to food and water become important. Weight loss, reduced caecotroph consumption or a hunched posture should prompt a veterinary check rather than being dismissed as ageing. Continue daily vitamin C supplementation and monitor hay intake closely, since appetite loss can become dangerous within a day in this species.

Diet and feeding

Unlimited grass hay, daily vitamin C-rich fresh vegetables and a measured fortified pellet

Guinea pigs cannot synthesise their own vitamin C and will develop scurvy without a reliable daily source, unlike rabbits, hamsters or rats. Provide a guinea-pig-specific fortified pellet plus fresh vitamin-C-rich vegetables such as pepper or kale daily, since vitamin C degrades quickly in stored feed and cannot simply be assumed from a bag's label. Unlimited grass hay must make up the bulk of the diet to support constantly growing teeth and healthy gut motility.

Introduce new vegetables gradually and avoid sudden large quantities, which can trigger digestive upset or bloat. Do not feed rabbit-formulated pellets as a substitute, since many lack adequate vitamin C for guinea pigs specifically. Treat fruit and starchy vegetables as occasional additions rather than dietary staples. A guinea pig that stops eating hay or pellets for more than a few hours needs prompt attention, since gut stasis can become life-threatening quickly in this species.

Daily care and ongoing checks

Every day

Check hay supply, fresh water, droppings and appetite every day, and offer a measured vitamin-C-containing vegetable portion. Guinea pigs are vocal and often wheek at the sound of feeding; a previously food-motivated animal going quiet deserves attention. Spot-clean bedding daily to reduce ammonia buildup, which can affect respiratory health, and check feet for early signs of pododermatitis on hard or damp flooring.

Regular maintenance and prevention

Provide supervised floor time in a safe, draught-free space if the main enclosure is not already generously sized, and handle gently with full body support since guinea pigs can struggle and fall. Trim nails regularly and check the rear end for soiling, which can attract flies in warm weather. Keep a weight chart, since gradual loss is often the first sign of dental disease, in addition to a dedicated plan for emergency out-of-hours exotic veterinary cover.

Behaviour and compatibility

Wheeking for food, popcorning when happy, chattering teeth when annoyed

With children: Good family pets with adult oversight of handling and cleaning
With other animals: Keep with other guinea pigs only
Training difficulty: Low

Health

Vitamin C deficiency (scurvy)
Dental malocclusion
Bladder stones
Respiratory infections
Ovarian cysts

Cannot synthesise vitamin C — dietary supply is mandatory. Needs an exotics-experienced vet

Special care requirements

Never house on wire floors; provide multiple hides so no pig is cornered

Daily vitamin C and gradual diet changes

Guinea pigs cannot make their own vitamin C, so a daily reliable source is essential rather than optional; rely on fresh vegetables and a guinea-pig-specific pellet rather than assuming a general small-mammal mix is adequate. A deficiency can develop within days and cause joint pain, poor healing and lethargy that is easy to mistake for general illness.

Introduce new foods gradually and keep unlimited grass hay as the bulk of the diet to protect both digestion and continuously growing teeth. A guinea pig that goes off hay for more than a few hours needs prompt attention, since gut stasis can progress quickly and become life-threatening in this species.

Before you take one on

Sources and further guidance

These welfare and veterinary resources inform general husbandry advice; they do not certify this profile or replace a species-experienced professional. Confirm exact environmental settings and feeding plans for your animal.

RSPCA: Guinea pig care

Can your home meet guinea pig needs?

Plan for a lifespan of 5–8 years, including holiday cover and, where one is available, a vet familiar with this species. Lifespan ranges are not guarantees.
Arrange the social setting before arrival. Social guidance for this species: Very high — keeping one alone is banned in some countries. Do not assume another animal of any species is a suitable companion.
Habitat priority for this species: Ground-level space matters more than height. Make sure your setup can provide this consistently. Check the room stays within the listed temperature range with a thermometer rather than judging by feel.
Key care point: Never house on wire floors; provide multiple hides so no pig is cornered. Discuss diet and any specialist needs with the supplier, rescue and a vet who treats this species, and check local legal requirements before acquiring an animal.

Educational reference, not an individual diagnosis or a verified professional review. Read our editorial policy.

Guidance libraries and further reading

These organisations publish relevant guidance. Their links are further reading, not evidence that they have reviewed this page.

RSPCA — animal care and welfare advice across species
PDSA — veterinary charity pet health advice
AVMA — American Veterinary Medical Association owner resources