Guinea Pig

Overview

The guinea pig (Cavia porcellus) is one of the most beloved small mammal pets - a vocal, social, ground-dwelling rodent originally domesticated in South America for food. Modern pet guinea pigs are friendly, communicative, and well-suited to families willing to invest in proper space, diet, and companionship.

Natural History & Origin

Domesticated by Andean peoples (in modern Peru, Ecuador, Bolivia) around 5,000 BC, originally for meat and ceremonial use. Spanish explorers brought them to Europe in the 1500s, where they became aristocratic pets. The wild ancestor is debated but likely Cavia tschudii.

Guinea pigs are not pigs, not from Guinea, and not closely related to other small rodents. Their nearest pet relatives are chinchillas and capybaras.

Appearance

Adults weigh 700-1200 g, length 20-25 cm.

Coat varieties:

• American (short smooth hair) - most common.
• Abyssinian (rosettes/whorls) - wiry hair in cowlicks.
• Peruvian (long hair) - needs daily grooming.
• Silkie/Sheltie (long backward hair) - no forehead sweep.
• Texel (long curly hair) - high maintenance.
• Skinny Pig (hairless) - special care.
• Many others.

Temperament & Handling

Friendly, vocal, social. Guinea pigs communicate in a wide vocabulary - squeaks, wheeks, purrs, chutters. They recognise owners and call out when humans approach the kitchen.

Generally easy to handle. Less likely to bite than hamsters or rats. Pick up by supporting the body fully (one hand under chest, one under hindquarters).

Housing

Minimum enclosure: 1 m² for one cavy, 1.2 m² for two - large rectangular pens, not tiny pet-shop cages. Cubes-and-coroplast (C&C) cages built from grid panels are the gold standard.

Provide:

• Hay constantly available (timothy or other grass hay).
• Hideouts (multiple).
• Heavy ceramic food bowl.
• Water bottle plus shallow bowl.
• Solid flooring (no wire bottom - causes pododermatitis).
• Paper-based bedding (no pine or cedar shavings).

Indoors only. Guinea pigs cannot regulate body temperature in heat or cold; outdoor housing is dangerous.

Diet

• Unlimited timothy or other grass hay (alfalfa for under 6 months only).
• Fresh leafy greens daily - romaine, parsley, cilantro, kale (limited), bell pepper.
• Plain timothy pellets - 1-2 tablespoons daily.
• Vitamin C - guinea pigs (like humans and great apes) cannot synthesise vitamin C. Daily fresh vegetables high in C (bell pepper, parsley) or vitamin C supplement essential. Deficiency causes scurvy.
• Limited fruit - small piece 2-3 times weekly.

Avoid: iceberg lettuce, dairy, grain-based treats, seeds, nuts, onion/garlic, chocolate.

Health & Lifespan

5-8 years average.

Major concerns:

• Vitamin C deficiency (scurvy) - universal without supplementation.
• Bumblefoot (pododermatitis) - from wire floors or wet bedding.
• Respiratory infections - common, can be fatal.
• Dental disease - overgrown molars.
• Bladder stones - calcium-related; reduce calcium-rich foods.
• Pregnancy complications - females over 6 months who haven't bred are at risk of dystocia. Never breed older first-time females.
• Ovarian cysts.
• Ringworm and parasites.

Find an exotic vet experienced with guinea pigs before getting one.

Social Needs

Guinea pigs are obligate herd animals. Keeping a single guinea pig is considered abusive in many countries (illegal in Switzerland). Always keep at least two, ideally same-sex pairs (two females or two neutered males).

Pros & Cons

Pros:

• Sociable, vocal, communicative.
• Easier to handle than most small mammals.
• Good for older children.
• Don't bite often.
• 5-8 year companions.

Cons:

• Must be kept in pairs (or more).
• Large space requirement.
• Daily fresh greens needed.
• Exotic vet required.
• Lifespan shorter than expected.

Best Suited For

• Families with children (older than 6, supervised).
• Households with space for large pen.
• Multi-pig homes.

Not suited for households unable to keep at least two, or those with no space for proper-sized enclosure.