Guinea Pig

The domestic guinea pig is descended from wild cavy species native to the Andean region of South America, particularly the highlands of Bolivia, Colombia, Ecuador and Peru. They were domesticated by Andean peoples over 3,000 years ago, initially as a food source and for ritual use; they were introduced to Europe by Spanish explorers in the 16th century and have been bred as companion animals ever since.

Guinea pigs are gregarious, gentle animals that live in small family groups in the wild and communicate through a distinctive range of vocalisations — the most characteristic being the high-pitched 'wheek' or 'squeal' they produce in response to excitement, anticipation of food, or to seek attention. Their calm, unhurried temperament and tolerance of gentle handling make them particularly suitable as pets for children and families.

Guinea pigs are entirely herbivorous and, like humans, are unable to produce their own Vitamin C. This is a critically important dietary consideration — chronic Vitamin C deficiency causes scurvy, which is a common and entirely preventable health problem in captive guinea pigs. Fresh Vitamin C-rich food must be provided daily.

Guinea pigs need more space than most people expect. A minimum enclosure size for two guinea pigs is 120cm L x 60cm W; for three or more, 150cm L x 60cm W is a minimum. Wire-floored cages must be avoided — guinea pigs have delicate feet and ankles that are easily injured on wire; solid-based cages with appropriate bedding are essential.

Indoor C&C (Coroplast and Cubes) grids enclosures are popular and allow easy customisation of size and layout, which is strongly recommended as they generally provide more space than standard hutches. Outdoor hutches must be weatherproof, shaded from direct sun, protected from rain, and securely constructed to prevent access by dogs, cats and foxes.

Bedding options include paper-based bedding (e.g. recycled paper pulp bedding), kiln-dried wood shavings, such as aspen or pine (cedar or inappropriately processed pine release aromatic oils which can cause respiratory problems), or fleece liners (washable and economical long-term). Hay should also be abundantly available as floor covering, which encourages natural foraging. A snug igloo hide or enclosed hut provides essential shelter and security. Guinea pigs are very susceptible to heat stress — enclosures must be well ventilated and never placed in direct sun; provide a cool area and a frozen water bottle on hot days.

Guinea pigs require a diet with three core components: hay, pellets and fresh vegetables. Hay should be available at all times and constitute approximately 70% of the total diet — it is essential for healthy digestion, dental wear (guinea pig teeth grow continuously) and gut motility.Oaten and Western Timothy Hay is the recommended staple for adult guinea pigs; Lucerne (Alfalfa) hay is higher in calcium and protein and is appropriate for young guinea pigs and pregnant or nursing sows, but should not be the sole hay for healthy adults.

Quality guinea pig pellets — such as a quality guinea pig pellet — should be offered in a ceramic bowl daily. Choose a pellet that is Vitamin C-fortified, as Vitamin C degrades rapidly in hay and seeds. A standard adult portion is approximately 1/8 cup per 500 g of body weight per day.

Fresh vegetables rich in Vitamin C should be offered daily. Excellent choices include capsicum (very high in Vitamin C), broccoli, kale, parsley, spinach, dandelion greens, and small amounts of carrot and apple (no seeds). Avoid iceberg lettuce (no nutritional value), celery (choking risk from stringy fibres), rhubarb, potato, tomato leaves, avocado, and onion. Fruit should be offered only occasionally due to high sugar content. Fresh water must be available at all times — a heavy ceramic bowl is more hygienic than a sipper bottle and most guinea pigs prefer to drink from a bowl. A salt lick mineral stone and a mineral stone should be provided.

Always support a guinea pig's full body when picking them up — slide one hand under the chest and front legs, and support the hindquarters with the other hand. Never grab by the back, scruff or tail (guinea pigs do not have a useful scruff, and their spine can be injured by unsupported lifting). Guinea pigs should always be handled close to the ground or seated, as they can be seriously injured by a fall.

Handle regularly and calmly from a young age. Place the guinea pig on your lap or a soft surface and allow them to explore at their own pace. Avoid sudden movements and loud noises. Children should always be supervised; teaching children to sit on the floor when holding a guinea pig is the safest approach.

Guinea pigs communicate through a rich range of vocalisations — the wheek or squeal (excitement and food anticipation), rumbling or purring (contentment or warning, depending on context), chutting (happy exploration sounds), and teeth chattering (a warning signal). They are most active during the early morning and late afternoon. With regular, calm handling, guinea pigs become confident and may follow their keeper around, solicit attention, and show clear signs of recognising familiar people.

Guinea pigs are active and benefit from environmental variety and opportunities to express natural behaviours. Providing a dedicated floor time area — a playpen or a small, enclosed room space — allows important exercise and exploration that a standard enclosure cannot provide. Scatter food items (pieces of vegetable, hay pellets) around the play area to encourage natural foraging and searching.

Provide a variety of safe toys — wooden chew toys (willow balls, wooden bridges), cardboard tunnels and boxes, hay-woven treat balls and small foraging wheels. Natural fresh branches from safe species (apple, willow, pear) provide both chewing enrichment and dental wear. A foraging mat of hay scattered with pellets and vegetable pieces mirrors natural feeding behaviour. Guinea pigs are naturally social and the presence of same-sex companions is itself the most fundamental form of enrichment — a lone guinea pig, however well fed and housed, is a stressed guinea pig.

Scurvy (Vitamin C deficiency): The most common preventable health problem in guinea pigs. Caused by inadequate Vitamin C in the diet. Signs include weight loss, lethargy, swollen joints, rough coat and reluctance to move. Prevent entirely with daily Vitamin C-rich fresh vegetables and Vitamin C-fortified pellets.

Dental disease (malocclusion): Guinea pig teeth grow continuously and can become misaligned, leading to inability to eat. Ensure adequate hay at all times and provide safe chews. Regular vet checks allow early detection.

Respiratory infections: Signs include sneezing, nasal discharge, laboured breathing and lethargy. Often triggered by draughts, damp bedding or stress.

Parasites (fur mites): Cause intense itching, hair loss and skin crusting. Treat with veterinary-recommended small animal parasite spray.

Gut stasis (GI stasis): Life-threatening cessation of gut movement, most often triggered by insufficient hay in the diet. Ensure hay is available at all times.

Bladder stones (uroliths): More common in females and linked to diets too high in calcium (excess Lucerne hay). Any guinea pig displaying pain, blood in urine or straining to urinate should be assessed by a vet promptly.