Peruvian guinea pig

The Peruvian is a long-haired breed of domestic guinea pig (Cavia porcellus). It is best known for a fine, silky coat that grows continuously and, in show animals, can trail well past the body to reach the floor. The hair grows forward over the head as well as back over the rump, so a fully coated Peruvian in profile can be hard to tell front from back.

In temperament the breed is friendly, gentle, calm, and docile. Peruvians tend to tolerate handling well, which is part of why they are popular both as pets and on the show bench. Adults are a medium-sized rodent, typically weighing between roughly 700 and 1,200 grams, with sows usually lighter than boars.

The long coat is the defining feature and the main commitment. Pet owners often keep the hair trimmed short for comfort and hygiene, while show owners maintain full length with daily grooming and wrapping. Either way, the breed needs more coat care than short-haired guinea pigs such as the American.

Who it suits

The Peruvian suits owners who can commit to regular, often daily, grooming. People who want a calm companion and are willing to keep the coat clean or trimmed will do well with the breed. It is less suited to households wanting a low-maintenance pet, or to homes that cannot keep at least one companion guinea pig, since the species is highly social and should not be kept alone.

The domestic guinea pig, Cavia porcellus, was domesticated in the Andean region of South America, in present-day Peru, Bolivia, Ecuador, and Colombia. Archaeological evidence points to domestication several thousand years ago, where the animals were raised by Andean peoples for food and used in ritual and folk medicine. They remain a traditional food animal in parts of the Andes today, where they are known as cuy.

Guinea pigs reached Europe in the 16th century through Spanish and Dutch traders, after which they were kept as exotic pets and selectively bred for appearance rather than for meat. Over time fanciers developed distinct coat types, including the long-haired forms.

The Peruvian is one of the oldest long-haired varieties recognised in the guinea pig fancy. The breed takes its name from the country tied to the species' origin, though the long coat itself was fixed through European and later international breeding rather than appearing in wild or working animals. The Silkie (or Sheltie) and the curly-coated Texel were later developed as related long-haired breeds.

Today the Peruvian is recognised by guinea pig and cavy clubs internationally and is a regular entrant in the long-haired classes at shows.

The Peruvian has a compact, rounded body typical of the guinea pig, but its outline is dominated by the coat. The hair is long, straight, and fine, growing from a centre parting along the back and falling to both sides. Two rosettes on the rump push the coat forward, so the longest hair sweeps over the face and head, often forming a frontal sweep that hides the eyes. In full show coat the hair can reach the ground and exceed the length of the body itself.

Coat and colors

The coat comes in the same range of colors and patterns seen across the guinea pig fancy, including solid self colors, agouti ticking, and tortoiseshell and white or tri-color patterns. The texture is the key point: it must be straight and silky rather than curly or coarse. Curl or harshness in the coat points toward another breed such as the Texel. Because the hair never stops growing, coat length in a given animal reflects its age and how it has been maintained.

Peruvians have a reputation as one of the calmer guinea pig breeds, which is fortunate given how much handling the coat requires. They are friendly and gentle, and most settle quickly into a routine of being picked up, brushed, and groomed. A relaxed temperament makes the breed a common choice for showing, where animals must tolerate handling by judges.

With people the breed is sociable and tends to learn to recognise its owners, often calling out at feeding time. With gentle older children it can be a good companion under supervision, though small children should be taught to handle any guinea pig carefully. The long coat means the breed is less suited to rough handling.

Guinea pigs are highly social herd animals. A Peruvian kept alone is prone to stress and boredom, so the species should be kept in pairs or small groups. Same-sex pairs or a neutered male with females are common arrangements. Introductions should be gradual, but the calm nature of the breed generally helps it live peacefully with other guinea pigs.

Coat care is the largest difference between a Peruvian and a short-haired guinea pig. The hair grows continuously and tangles easily, so it must be brushed often and kept clean around the rear end. Pet owners commonly keep the coat trimmed short for hygiene and comfort, while show owners maintain full length using wraps or wrappers to protect the hair.

Grooming

• Brush the coat daily with a soft brush or wide-tooth comb to prevent mats.
• Trim hair around the rear and feet to keep it clean and free of droppings.
• Spot-clean soiled hair; bathe only when needed, using a small-animal shampoo, and dry thoroughly.
• For show animals, divide the coat and use wraps to keep length tidy and prevent breakage.
• Check and trim nails every few weeks.

Exercise

• Provide daily time in a safe, enclosed floor area or run for movement and foraging.
• Keep the cage uncluttered so the long coat does not snag on hides or toys.
• Offer tunnels and forage opportunities rather than wheels or balls, which are unsafe for guinea pigs.

Environment

Keep guinea pigs indoors or in a sheltered, predator-proof space at a steady temperature of roughly 18 to 24 C, away from draughts and direct sun. The long coat makes Peruvians sensitive to damp and heat, so bedding must stay clean and dry. Solid-floor housing with soft bedding protects the feet and the coat.

Like all guinea pigs, the Peruvian is a strict herbivore with a hindgut that depends on a high-fibre diet. Unlimited grass hay, such as timothy or meadow hay, should make up the bulk of the diet and is needed both for digestion and to wear down the continuously growing teeth. Fresh water must always be available.

Guinea pigs cannot synthesise vitamin C and must get it from their diet. A guinea-pig-specific pellet fortified with stabilised vitamin C, plus fresh vegetables high in the vitamin, helps prevent deficiency.

Treats and supplements

Use fresh vegetables high in vitamin C as everyday food rather than treats: bell pepper, leafy greens, and small amounts of broccoli are good choices. Fruit such as a small slice of apple or a few berries should be occasional only, because of its sugar content. A varied vegetable selection plus fortified pellets usually supplies enough vitamin C; vitamin drops added to water are not recommended, as they degrade quickly and may put the animal off drinking. Ask a vet before adding any supplement.

With good care a Peruvian usually lives 5 to 7 years. The breed is generally hardy, but its long coat raises the importance of cleanliness: hair soiled around the rear can trap droppings and urine, which in warm weather can lead to fly strike, a serious condition where flies lay eggs in the coat. Daily checks and trimming reduce this risk.

Most Peruvian health problems are the same ones seen across guinea pigs.

Preventive care

• Feed unlimited hay and a vitamin C source to prevent dental and scurvy problems.
• Groom and inspect the coat and skin daily, especially around the rear.
• Keep bedding clean and dry and housing well ventilated.
• Weigh weekly; steady weight loss is an early warning sign.
• Find a vet experienced with small mammals before problems arise.

Guinea pigs need far more floor space than typical pet-shop cages provide, and the Peruvian is no exception. A solid floor with soft bedding protects both the feet and the long coat, which can drag in wire-floor or dirty enclosures. House at least two guinea pigs together, and scale the space up for each additional animal. Because the coat is prone to damp and heat damage, housing should be indoors or in a well-sheltered, ventilated location.

Setup checklist

• Large solid-floor cage, C&C grid setup, or sheltered run.
• Deep layer of dust-free, absorbent bedding.
• Hay rack or pile kept clean and dry.
• Water bottle and a heavy food bowl.
• One hide per guinea pig, with openings wide enough not to snag the coat.
• Daily spot-cleaning and a full clean each week.

Breeding guinea pigs carries real risk and should only be attempted by experienced keepers. Sows mature sexually at around 4 to 6 weeks and boars at about 8 to 9 weeks, so the sexes must be separated early to avoid unplanned litters. A critical point with sows is timing: if a sow is bred for the first time after roughly 6 to 8 months of age, the pelvic joint may have fused, making natural birth dangerous or impossible. Responsible breeders plan first litters accordingly.

Gestation is long for a small rodent, around 59 to 72 days. Guinea pigs are precocial, so pups are born fully furred, with open eyes and teeth, and can move about and nibble solid food within days. Litters are usually small, with 2 to 4 pups being typical.

The sow nurses the young, but pups begin sampling hay and vegetables almost immediately and are usually weaned by about 3 weeks. With the Peruvian, pups are short-coated at birth and the long adult coat develops as they grow. Young intended for showing are assessed as the coat matures, and males should be separated from the mother and sisters before they reach breeding age.