Guinea pigs are the UK’s third most popular small pet, with an estimated 1.5 million living in British homes. They’re social, vocal, and full of personality — but they’re also commonly misunderstood and under-cared-for. This comprehensive guide covers everything from cage setup to health checks, drawing on the latest RSPCA and veterinary guidelines.
Housing & Cage Setup
The single biggest mistake guinea pig owners make is providing too small a cage. The RSPCA minimum for two guinea pigs is 120cm × 60cm (0.7m²), but bigger is always better. Guinea pigs are active animals who need space to run, popcorn, and forage.
For detailed cage size requirements and DIY options, see our guinea pig cage size guide. If you prefer building your own C&C cage, our DIY cage guide has step-by-step instructions.
Bedding
Use dust-free hay, fleece liners, or paper-based bedding. Avoid cedar and pine shavings (the aromatic oils irritate respiratory systems). Spot-clean daily and full clean weekly. For our recommended cleaning routine, see how to clean a guinea pig cage.
Diet & Nutrition
Guinea pigs are one of the few mammals (along with humans) that cannot synthesise Vitamin C. This makes diet absolutely critical:
- Unlimited hay: 80% of their diet. Timothy hay is ideal for adults. Essential for digestive health and dental wear.
- Fresh vegetables daily: 1 cup per pig per day. Bell peppers (highest Vitamin C), romaine lettuce, cucumber, coriander.
- Pellets: 1 tablespoon per pig per day. Choose Vitamin C-fortified pellets.
- Fresh water: Always available from a bottle or heavy bowl.
For a complete list of safe and dangerous foods, see our guide on foods guinea pigs shouldn’t eat.
Behaviour & Socialisation
Guinea pigs are highly social herd animals and should never be kept alone. A single guinea pig will become depressed, anxious, and may stop eating. The ideal setup is a pair of the same sex (two sows or two neutered boars).
Understanding guinea pig vocalisations and body language is key to good ownership. Discover what popcorning, wheeking, and rumblestrutting mean in our guinea pig behaviour guide.
Enrichment & Toys
Guinea pigs need daily enrichment to prevent boredom and stereotypic behaviours. Effective enrichment includes:
- Tunnels and hideys (at least one per pig)
- Foraging opportunities (scatter hay in different locations)
- Safe chew toys (untreated apple wood, hay balls)
- Supervised floor time outside the cage (daily, in a guinea pig-proofed room)
For toy ideas and enrichment inspiration, see what toys do guinea pigs play with.
Health & Grooming
Guinea pigs hide illness until it becomes severe — a survival instinct from being prey animals. Regular health checks are essential:
- Weekly weigh-ins: Weight loss is often the first sign of illness
- Nail trimming: Every 3-4 weeks. See our step-by-step guinea pig nail trimming guide.
- Dental checks: Overgrown teeth cause pain and anorexia. Unlimited hay is the best prevention.
- Skin checks: Look for patches, scratching, or hair loss (often fungal or mites)
Frequently Asked Questions
Can guinea pigs live alone?
No. Guinea pigs are herd animals who become stressed and depressed when kept alone. Always keep at least two together. Same-sex pairs (two sows or two neutered boars) work best. In Switzerland, it’s actually illegal to keep a single guinea pig.
How long do guinea pigs live?
Average lifespan is 5-7 years, with some reaching 8-10 years. This is significantly longer than hamsters (2-3 years) or gerbils (3-4 years), so guinea pig ownership is a longer commitment.
Can guinea pigs live outside in the UK?
Yes, but only with proper insulation and weather protection. Guinea pigs are vulnerable to temperatures below 15°C and above 26°C. In winter, many UK owners bring them indoors or use heated pads. A well-insulated hutch with a weatherproof cover is essential for year-round outdoor living.
Reviewed by Dr. Sarah Jenkins, MRCVS
Dr. Jenkins is a fully practicing veterinary surgeon in the UK with over 15 years of clinical experience in small animal medicine and canine behaviour. She reviews and verifies our health content to ensure medical accuracy.