Rex Guinea Pig

Origin: United Kingdom
Size: 10–17 in (25–43 cm)
Coat: Short, woolly, upright
Lifespan: 5–6 years

Beginner careCalmGentlePatient

The Rex is one of the largest guinea pig breeds, and its coat is unique: short hairs that stand upright with no guard hairs, giving a dense, woolly texture like a hedgehog made of velvet.

Rexes are gentle giants, calm, patient, and famously good with children. The upright coat needs little grooming, though their large feet and droopy ears benefit from regular health checks.

Rex Guinea Pig at a glance

Size: 10–17 in (25–43 cm)
Adult weight: Adult guinea pigs commonly weigh about 700 to 1,100 g (1.5 to 2.5 lb); this is not a breed-specific target
Lifespan: 5–6 years
Care difficulty: Beginner

The size and lifespan above are approximate, not guarantees. Care difficulty describes grooming workload, not personality. Individual temperament varies, and every breed needs daily care, suitable companionship and veterinary support.

Coat and grooming

Brush the short, upright coat gently about once a week to remove loose hair and bedding.
Look beneath the dense coat for sores, flakes or parasites instead of relying on how the surface feels.
Check nails and the soles of the feet regularly; trim nails safely or have a vet show you how.
Inspect the outer ears without inserting cotton buds or applying cleaners unless a vet recommends them.

Health risks to watch

A thick coat can make changes in body condition harder to see. Weigh weekly and ask your vet about a suitable individual target.
Sore feet, overgrown nails or reduced movement need attention; clean bedding and suitable flooring matter for every breed.
Drooling, selective eating or dropping food can be signs of dental problems and should be checked by a vet.
Not eating, fewer droppings or difficulty breathing requires urgent care. Do not assume a quiet pig is simply calm by nature.

This is general information, not veterinary advice. If you notice a change in eating, breathing, droppings or behavior, contact an exotic vet.

Who is it best for?

Owners wanting relatively low coat-maintenance requirements
Beginners who can provide regular nail, skin and weight checks
Families prepared to choose by individual temperament and supervise all handling

Probably not ideal for

People choosing only for an expected giant size or guaranteed gentle temperament
Homes without adequate floor space, daily cleaning or compatible companionship

Rex Guinea Pig questions

How big will a Rex guinea pig grow?

Individual adult size varies. Do not use a claimed maximum length as a target or overfeed to reach it. Your vet can assess weight and body condition for your own pig.

Are Rex and Teddy guinea pigs the same?

No. Both have short, upright, textured coats, but they are distinct breed types. A photo alone may not reliably distinguish a mixed-breed pet.

Does a Rex need daily brushing?

Usually not. A gentle weekly brush is generally enough for an uncomplicated short coat, alongside daily checks for dirt or changes in health.

Are Rex guinea pigs always good with children?

No breed guarantees that. Children need adult supervision, and the pig needs secure support, gentle handling and the option to retreat.

Sources and further reading

These references cover breed and coat identification, grooming and general guinea pig health. Health watch points are not a claim that this breed is uniquely prone to those conditions.

Guinea pig care guidance, made for cavies