How to Care for Guinea Pigs: Diet, Housing and Daily Health Checks

By Dr Duncan Houston

Good guinea pig care starts with a few daily essentials: constant access to hay, a dependable source of vitamin C, compatible company and enough space to move and hide.

Small changes in eating can be more important than a dramatic-looking cage problem. Knowing each guinea pig's normal appetite, droppings and weight helps you recognise when routine care needs to become veterinary care.

Quick Answer

Guinea pigs need unlimited grass hay, suitable vegetables, measured guinea pig pellets, fresh water and daily vitamin C. Keep them with compatible guinea pigs in spacious, clean housing and provide gentle handling and opportunities to forage. Check each animal daily, and contact a vet immediately if eating decreases or droppings become fewer or stop.

What should guinea pigs eat every day?

Hay first: keep good-quality grass hay, such as timothy or orchard grass, available continuously. Chewing it supports the teeth and digestion.
Guinea pig pellets: offer a measured portion of plain, grass-based pellets fortified with vitamin C. Follow the food's feeding guidance and ask your vet to adjust it for weight, age and health. Rabbit pellets and colourful seed mixes are unsuitable substitutes.
Fresh vegetables: offer a varied selection of washed leafy greens and vegetables, including bell pepper. Introduce unfamiliar foods gradually and remove uneaten fresh food before it spoils.
Water: provide constant access in a stable bowl or working bottle. Replace water daily and check the bottle nozzle for blockages. Each guinea pig must be able to reach food and water without being chased away.

The RSPCA's guinea pig feeding guidance recommends hay as the main food and individual adjustment of pellet quantities. Fresh, untreated grass can supplement hay when introduced gradually; never offer lawnmower clippings.

How do you provide enough vitamin C?

Guinea pigs cannot make their own vitamin C. Provide it every day through appropriate fresh vegetables and fortified pellets. Vitamin C content falls during storage, so check dates and storage instructions and replace stale food. A bowl containing pellets does not prove that every guinea pig has eaten enough.

Requirements vary with body size and health, and increase during growth, pregnancy, nursing and illness. A vet can review the whole diet and recommend a direct oral supplement when needed. Do not rely on vitamin C added to drinking water: it degrades and may discourage drinking. See the MSD Veterinary Manual's nutrition guidance.

Young, pregnant or nursing guinea pigs need a different nutritional plan from healthy adults. Arrange individual advice instead of simply increasing every food.

What housing do guinea pigs need?

Prioritise usable ground space with solid flooring. MSD recommends 7.5 square feet for one animal plus approximately 2 to 4 square feet for each additional guinea pig. Treat this as a minimum reference, provide more wherever possible, and do not count upper platforms as a substitute for room to run.

Use absorbent paper bedding or properly maintained fleece without loose threads. Provide several hides, preferably with more than one exit, and more hiding places than guinea pigs. Remove wet bedding daily and clean thoroughly at least weekly, sooner when needed.

Keep housing ventilated, dry and protected from predators, direct sun and temperature extremes. Check conditions at enclosure level. The RSPCA's housing advice identifies approximately 17 to 20°C as ideal indoors and warns that temperatures above 26°C can cause heatstroke. Outdoor accommodation also needs secure shelter and a plan for unsuitable weather.

Can guinea pigs live alone or with rabbits?

Plan for at least two compatible guinea pigs unless a vet or qualified behaviour professional advises otherwise. Human attention does not meet all their social needs. A compatible same-sex pair or a neutered male with females can work; have their sex confirmed and ask the operating vet when a neutered male can safely join females.

Introduce unfamiliar guinea pigs gradually under supervision in neutral space. Provide separate feeding points and escape routes. Persistent bullying, biting or blocking access to food requires intervention, not an expectation that they will eventually settle. Neutering does not reliably resolve fighting.

Rabbits are unsuitable companions because their communication, diet and physical behaviour differ, and they can injure guinea pigs. A rescue experienced in bonding can help find a suitable match. These principles follow the RSPCA's companionship guidance.

Which changes need attention?

Level and signs	Possible meaning	Action and timing
Routine: eating normally, usual droppings, comfortable movement	Daily care appears to be meeting current needs	Continue daily checks and record weight regularly.
Welfare concern: one animal repeatedly hides or cannot reach food	Bullying, unsuitable housing or pain	Make food and shelter accessible now; seek advice promptly. Reduced eating needs immediate veterinary contact.
Urgent: eating less, fewer droppings, drooling or painful urination	Possible dental, digestive or urinary disease	Call a guinea pig-experienced vet immediately for assessment arrangements.
Emergency: breathing difficulty, collapse or a painful swollen abdomen	Potentially life-threatening illness	Contact an emergency vet and travel for care now.

Why might a guinea pig become quiet or stop eating?

Do not assume a quiet guinea pig is simply shy. Stress and food competition can reduce intake, but dental pain, digestive disease, vitamin C deficiency and urinary stones are important alternatives. Normal-looking front teeth do not rule out painful back teeth. See MSD's guidance on common guinea pig health problems and dental and urinary disease.

Your vet may assess hydration, weight, mouth, abdomen and breathing, then recommend imaging or other tests. Treatment depends on the cause; early recognition gives more opportunity to help.

When is this an emergency?

Seek emergency care now for difficult breathing, collapse, severe weakness, a painful swollen abdomen, inability to pass urine or rapidly worsening illness. Complete refusal of food also requires immediate veterinary contact. Do not wait overnight to see whether appetite returns.

Keep handling calm and transport in a secure, ventilated carrier. Offer familiar hay if your guinea pig can eat voluntarily. Ask the vet about assisted feeding; do not force food or water into an animal that is struggling to breathe, cannot swallow or has marked abdominal swelling. Never give leftover antibiotics or another pet's medicine.

A practical daily and weekly care plan

Daily: watch each guinea pig eat, check droppings and water, remove wet bedding, and look for changes in movement, eyes, feet and rear end.
Weekly: weigh each animal on the same scales and record the result. A repeated downward trend deserves veterinary advice even when the food bowl is empty. Check nails and arrange trimming according to growth.
Grooming: brush long coats daily and check shorter coats regularly. Avoid routine bathing or applying oils and cleaners to sore skin; investigate persistent dirt, urine staining or irritation.
Veterinary planning: arrange at least annual checks and an individual schedule for older or chronically unwell animals. Identify an emergency practice that treats guinea pigs before you need it.

The RSPCA's health checklist also recommends twice-daily checks of the rear end in warm weather because soiling attracts flies.

Common care mistakes

Filling up on pellets or treats while hay intake falls.
Assuming old fortified pellets guarantee adequate vitamin C.
Judging both animals' appetites from one shared bowl.
Waiting for obvious weight loss before acting on reduced eating.
Trimming teeth at home or using medicines prescribed for another species.

Exercise, enrichment and gentle handling

Provide daily opportunities to explore a safe exercise area with tunnels and shelters. Scatter part of the normal food ration for foraging, and introduce new objects gradually while keeping familiar hiding places. Guinea pigs have activity and resting periods throughout the day; allow undisturbed rest.

Approach at floor level and let them investigate. When lifting is necessary, support the chest and hindquarters and hold them close to your body. Children should interact while seated with adult supervision. A predictable routine and freedom to retreat help build trust.

Frequently asked questions

Do guinea pigs need vitamin C supplements every day?

They need vitamin C every day, but an adequate diet may supply it without an extra supplement. Ask your vet to review intake, especially during illness, growth or pregnancy. VCA's feeding advice explains this distinction.

Can two male guinea pigs live together?

Yes, compatible males can live together. Personality, space and careful introductions matter. Neutering alone is not a solution for fighting.

How often should I clean a guinea pig cage?

Remove wet bedding and food waste daily, with a thorough clean at least weekly. Increase cleaning if bedding stays damp or becomes dirty sooner.

Can I wait until tomorrow if my guinea pig stops eating?

No. Contact a vet immediately. Digestive problems can deteriorate quickly, and the cause may require treatment as well as feeding support.

Build care around consistent food, compatible company and knowing each animal's normal behaviour. When appetite or droppings change, acting promptly matters more than trying several home remedies.

For clear information to support your everyday care decisions, visit ASK A VET™. A guinea pig that is unwell needs timely assessment by a vet who treats the species.