# Guinea Pig — Facts, Threats & Conservation

*Cavia porcellus (Linnaeus, 1758)*

> The guinea pig (Cavia porcellus) is a domesticated South American rodent that must live with companions, needs daily vitamin C and spacious enclosures — not solitary confinement in small hutches.

**IUCN status:** Domesticated — not assessed; wild Cavia aperea Least Concern  ·  **WARN range:** Worldwide — domestic; wild ancestor in South America

## Quick facts
| Fact | Value |
| --- | --- |
| Weight | 0.7–1.2 kg |
| Lifespan | 5–7 years with good care |
| Social rule | Minimum two compatible companions |
| Diet staple | Unlimited hay plus daily vitamin C |
| Wild ancestor | Andean cavy (Cavia aperea complex) |
| CITES | Not listed — domestic |

## Scientific classification
- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Mammalia
- **Order:** Rodentia
- **Family:** Caviidae
- **Genus:** Cavia
- **Species:** Cavia porcellus (Linnaeus, 1758)

## Conservation status
- **Status:** Domesticated — not assessed on IUCN Red List. Wild Cavia aperea Least Concern.
- **Population:** Tens of millions worldwide as pets and livestock
- **Trend:** Stable — commercial and pet trade
- **Assessed:** 2008 (Cavia aperea)
- **CITES:** Not listed

## Key facts: Guinea Pig
- Guinea pigs are strictly social — single-guinea-pig keeping causes loneliness and stress.
- They cannot synthesise vitamin C and need fresh vegetables or supplements daily.
- Prey instincts mean they hide illness until it is advanced — weigh weekly.
- Wire-bottom cages and small pet-shop hutches cause foot sores and boredom.
- Descended from Andean cavies — not pigs and not from Guinea.
- WARN's twelve-breed library covers coat types, temperament and health by variety.

## From Andean livestock to family companion
Guinea pigs were domesticated in the Andes more than 3,000 years ago, long before European contact. Indigenous communities raised cavies for meat and ceremonial use at altitudes where larger livestock struggled. Spanish colonists brought them to Europe, where they became laboratory animals and fashionable pets. The name 'guinea pig' is misleading — they are rodents of the family Caviidae, not pigs, and their origin lies in South America rather than West Africa.

Every modern guinea pig is Cavia porcellus, a fully domestic species with no self-sustaining wild population. Releasing pet cavies outdoors is cruel and illegal in many countries — they lack survival skills and suffer predation, starvation and temperature extremes within days.

## Social needs and behaviour
Guinea pigs are herd animals that communicate through wheeks, purrs, rumble-strutting and subtle body language. Keeping a single cavy in isolation causes measurable stress: reduced feeding, over-grooming and heightened fear responses. Welfare codes in Britain and the EU recommend housing at least two compatible animals after careful introduction.

Boars (males) may fight without adequate space and enrichment; neutering and large enclosures reduce conflict. Sows (females) usually pair or group well. Bonded companions should not be separated casually — losing a cage-mate causes grief visible in appetite loss and vocal searching.

## Housing, diet and health
Minimum enclosure sizes in UK guidance start around 1.5 m² for two guinea pigs, with larger always better. Solid floors covered in absorbent bedding protect feet — wire mesh floors cause bumblefoot. Hideouts, tunnels and hay racks support natural foraging. Daily exercise on grass (in secure runs) or indoor floor time prevents obesity.

Unlimited timothy or meadow hay should form most of the diet, supplemented with guinea-pig pellets fortified with vitamin C, fresh vegetables (pepper, kale, parsley) and clean water. Scurvy from vitamin C deficiency causes painful joints, dental problems and death. Teeth grow continuously — dental malocclusion is common and needs veterinary trimming.

## Welfare pitfalls and responsible ownership
Pet shops still sell solitary guinea pigs in cages far below recommended size. Impulse purchases at Easter and Christmas flood rescues by spring. Classroom pets rarely receive weekend and holiday care. Breeding 'accidents' from mis-sexed pairs produce surplus animals with limited rehoming options.

Responsible ownership means adopting from rescues, neutering where appropriate, budgeting for exotic-veterinary bills and committing to five to seven years of daily care. Children should be supervised — guinea pigs are not toys and should never be grabbed around the middle. WARN advocates adoption over purchase and opposes breeding for colour when rescues are full.

## Explore guinea pig breeds on WARN
Coat type changes grooming workload dramatically — from low-maintenance Americans to daily-brushed Peruvians. WARN publishes a twelve-breed guinea pig library at /wildlife-guides/guinea-pig covering American, Abyssinian, Peruvian, Silkie, Teddy, Rex and more, each with temperament notes, typical weight, common health issues and responsible-care FAQs.

Use the library to match breed to household: long-coated varieties suit experienced owners with time to groom; smooth-coated types suit families who still provide companionship and space. Every breed shares the same social and dietary rules — coat length does not reduce the need for a companion or vitamin C.

## Guinea Pig Breeds Guide
From the American and Abyssinian to the Peruvian, Silkie, Teddy, Rex, Skinny, Himalayan, Texel and Coronet — explore 12 of the world's most searched guinea pig breeds with temperament, lifespan, common health issues and responsible welfare guidance.

Full breed library (12 guides): https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig#breeds

- **American:** The classic short-haired pet guinea pig — smooth coat and easy grooming. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/american
- **Abyssinian:** Distinctive rosettes of fur standing in cowlicks — a textured, lively companion. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/abyssinian
- **Peruvian:** Silky hair grows forward over the face — show-stopping but high-maintenance. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/peruvian
- **Silkie:** Long, soft hair sweeps backward like a mane — softer than the Peruvian coat. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/silkie
- **Teddy:** Dense, springy coat with a kinked, plush texture — the 'teddy bear' cavy. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/teddy
- **Rex:** Short, woolly coat with no guard hairs — soft and slightly coarse at once. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/rex
- **Skinny:** Mostly hairless with fuzzy face and feet — requires warm housing and skin care. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/skinny
- **Himalayan:** White body with dark nose, ears and feet — points darken in cooler conditions. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/himalayan
- **Texel:** Long curls cover the entire body — one of the most demanding cavy coats. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/texel
- **Coronet:** Silkie-length coat with a central crest rosette — long hair plus a crown. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/coronet
- **Crested:** A smooth-coated guinea pig with a single rosette or 'crown' on the head — a show favourite. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/crested
- **Lunkarya:** Long, coarse, tousled fur with a wild 'bad hair day' look — high-maintenance but striking. — https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig/lunkarya

## What WARN does
WARN publishes free companion-animal welfare guides worldwide. While guinea pigs are domestic, the same principles — honest care standards, adoption over impulse purchase, and opposition to inadequate pet trade housing — underpin our exotic-pet and rescue education in partner countries.

If this guide helps you understand wildlife and the pressures it faces, a gift to WARN supports habitat protection and free public education in our partner countries.

## Frequently asked questions: Guinea Pig
### Can guinea pigs live alone?
No. Guinea pigs are social prey animals and should live with at least one compatible companion after careful introduction. Single-guinea-pig keeping causes loneliness and stress in most cases.

### Why do guinea pigs need vitamin C?
Like humans, guinea pigs cannot synthesise vitamin C. Deficiency causes scurvy — painful joints, poor wound healing and dental disease. Fresh vegetables and fortified pellets are essential daily.

### How long do guinea pigs live?
With good diet, companionship and veterinary care, guinea pigs typically live five to seven years, sometimes longer. Lifespan shortens with poor housing, solitary keeping and untreated dental disease.

### Are guinea pigs good pets for children?
They can be suitable with adult supervision and proper setup — but they are not low-maintenance starter pets. They need daily care, companions, space and quiet handling. Classroom and holiday neglect is a common welfare failure.

### Where did guinea pigs come from?
Guinea pigs were domesticated in the Andean highlands of South America more than 3,000 years ago from wild cavy ancestors. They are not from Guinea and are not related to pigs.

### Where can I read about guinea pig breeds?
WARN's guinea pig wildlife guide at /wildlife-guides/guinea-pig links to a twelve-breed library with coat types, temperament, health notes and care FAQs for each variety.

## Sources
- [IUCN Red List — Cavia aperea](https://www.iucnredlist.org/)
- [RSPCA — guinea pig care](https://www.rspca.org.uk/adviceandwelfare/pets/rodents/guineapigs)
- [PDSA — guinea pig welfare](https://www.pdsa.org.uk/pet-help-and-advice/looking-after-your-pet/small-pets/guinea-pigs)

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Full guide: https://worldanimalrescuenetwork.org/wildlife-guides/guinea-pig