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Guinea pigs need a high-fiber diet built around unlimited grass hay, with measured guinea-pig pellets, washed leafy greens and vitamin-C-rich vegetables every day. Fruit and carrots are occasional treats, not staples. Never feed potatoes, onions, rhubarb leaves or oxalis clover, and introduce every new food gradually.
The safe guinea-pig diet at a glance
Guinea pigs are obligate herbivores and hindgut fermenters. Their digestive system is adapted to a high-fiber, relatively low-energy diet, and their teeth need constant abrasive chewing. A practical adult feeding pattern is:
- Grass hay: available at all times and making up roughly 80% of the diet, according to Animal and Veterinary Service guidance published in 2026.
- Fresh vegetables and greens: about 1–2 cups per day for a typical adult, with leafy greens and vitamin-C-rich vegetables doing most of the work.
- Plain guinea-pig pellets: a small, measured serving of fresh timothy-based pellets.
- Fruit and carrots: tiny, infrequent treats; fruit should be no more than 5% of total daily food intake under the University of California, Davis guidance.
- Water: clean drinking water supplied every day.
This balance matters more than any single “superfood.” Hay supports normal gut movement and tooth wear, greens provide moisture and micronutrients, pellets fill nutritional gaps when used sparingly, and limiting sugary foods helps prevent an unbalanced diet.
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Hay: the food that should never run out
Keep fresh grass hay in the enclosure continuously. The UC Davis School of Veterinary Medicine specifically recommends high-quality timothy or another grass or oat hay at all times; Merck also identifies grass hay as the main food for adult guinea pigs.
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Which hay to choose
- Timothy hay: a dependable everyday choice for healthy adults.
- Orchard grass and other grass hays: suitable alternatives when the hay is clean, dry and accepted by the guinea pig.
- Oat hay: another grass-based option that can add variety.
- Alfalfa hay: richer in calories, protein and calcium. Merck notes that growing, pregnant or lactating guinea pigs may need alfalfa hay or alfalfa-based pellets, while adult maintenance diets generally use grass hay.
Good hay smells fresh, feels dry rather than damp, and contains no visible mold, webbing or dusty spoilage. Store it in a dry, ventilated place rather than a sealed plastic container that can trap moisture. Offer enough that your guinea pig can nibble throughout the day and replace hay that becomes wet or soiled.
Why hay is more than a filler
Long fiber keeps food moving through the digestive tract and provides the chewing time needed to wear continuously growing teeth. Replacing hay with vegetables, pellets or treats can leave a guinea pig eating too little fiber even when the bowl looks full.
Vegetables and leafy greens for daily feeding
Fresh produce should be mainly leafy greens and vegetables that contribute vitamin C without displacing hay. Merck’s 2026 diet guidance gives 1–2 cups of fresh produce per day for a typical adult. Spread that amount across the day if your guinea pig prefers several small meals.
Reliable regular choices
- Bell peppers, especially red, yellow or green peppers, for a dependable vitamin-C source.
- Romaine, red-leaf or green-leaf lettuce. Avoid treating watery lettuce as a replacement for hay.
- Cucumber in modest portions.
- Parsley and cilantro.
- Dandelion greens from a location free of pesticides, road contaminants and animal waste.
- Collard greens and kale, rotated with other greens rather than used as the only vegetable.
- Radish tops and beet greens.
- Broccoli leaves and similar leafy parts.
Wash produce under running water, remove damaged portions and cut pieces into manageable sizes. Pick greens from a known edible plant; do not rely on a photograph or a casual identification for plants collected outdoors.
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Calcium and oxalate: why variety matters
Leafy vegetables differ in calcium and oxalate content. Parsley, kale, collard greens and beet greens can be useful foods, but rotating them with lettuce, bell pepper and cucumber prevents one mineral profile from dominating the diet. A guinea pig with a history of urinary stones or other urinary disease needs an individualized plan from an exotic-animal veterinarian rather than a generic “unlimited greens” rule.
Pellets: useful, but measure them
Choose a plain, guinea-pig-specific pellet made primarily from timothy or another appropriate grass. NC State Veterinary Hospital advises avoiding mixes that contain seeds, nuts or dried fruit; those ingredients encourage selective eating and add unnecessary fat or sugar.
Offer a small measured portion rather than keeping a bowl permanently full. The exact amount depends on the pellet’s formulation, the guinea pig’s size and life stage, and the amount of hay and produce being eaten. Follow the product’s feeding directions and your veterinarian’s advice, while making hay the unrestricted food.
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Vitamin C in pellets does not last forever
Manufactured vitamin C breaks down during storage. Check the manufacturing or mill date, buy bags that can be used while fresh, close the package tightly and rotate older stock. Do not assume that a pellet is supplying its labeled vitamin C months after opening.
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Vitamin C: an essential daily nutrient
Guinea pigs cannot synthesize vitamin C, so they must obtain it from food or a reliable supplement. UC Davis guidance from 2019 gives a supplemental range of 10–30 mg per day. Merck’s 2026 guidance describes typical adult needs of about 10–25 mg per kilogram of body weight daily, with higher needs for growing, pregnant, lactating or ill animals. These figures are guidance ranges, not a reason to megadose a healthy pet.
Food-first sources
Fresh bell pepper is an easy daily source. Leafy greens and other suitable vegetables contribute additional vitamin C. Offering a variety of fresh produce is more dependable than trying to calculate a precise amount from one food whose nutrient content varies with variety and storage.
Supplements and water additives
A veterinarian may recommend a vitamin-C tablet or another supplement when diet alone is insufficient, during illness, or for a life stage with higher requirements. Do not depend on vitamin C added to drinking water. UC Davis, Merck and NC State note that it can degrade quickly, taste unpleasant and reduce drinking, leaving the guinea pig less hydrated and still not reliably supplemented.
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Safe-food comparison chart
| Food | Fiber role | Vitamin C contribution | Sugar level | Calcium or oxalate considerations | Appropriate frequency | Main risk |
|---|---|---|---|---|---|---|
| Timothy, orchard or other grass hay | Highest; supports gut function and tooth wear | Low | Very low | Generally suitable as the adult base | Unlimited, always available | Mold, dampness or replacing it with lower-fiber foods |
| Bell pepper | Moderate | High and useful for daily coverage | Low | Generally moderate; rotate with other vegetables | Regular daily produce | Spoilage or offering so much that hay intake falls |
| Romaine or red-leaf lettuce | Moderate | Some | Low | Usually a gentle leafy choice | Regular rotation | Using watery lettuce as the entire diet |
| Parsley, kale, collards, dandelion or beet greens | Moderate | Some to useful | Low | Mineral and oxalate levels vary; rotate rather than rely on one green | Regular rotation in measured portions | Overfeeding one type or collecting contaminated plants |
| Cucumber | Lower than hay and leafy greens | Small contribution | Low | Generally moderate | Regular, modest portions | Displacing fiber-rich foods with watery produce |
| Broccoli leaves | Moderate | Useful | Low | Rotate with other greens | Regular rotation | Gas or digestive upset if introduced too quickly |
| Carrot | Low to moderate | Not a primary source | Higher than leafy greens | Not a substitute for greens | Occasional tiny treat | Sugar and excess calories |
| Apple, grapes, berries or orange | Low | Varies; not a replacement for vegetables | Higher | Use small pieces; remove seeds, stems and spoiled portions | Occasional treat; fruit no more than 5% of daily intake | Sugar, diarrhea or choking on poorly prepared pieces |
| Plain timothy-based guinea-pig pellets | Lower than hay | Added vitamin C may decline during storage | Low when free of dried fruit | Formulation varies; use the label and veterinary advice | Small measured serving | Seed, nut or dried-fruit mixes and stale vitamin C |
| Alfalfa hay or alfalfa-based pellets | High | Not the main reason to feed it | Low | Richer in calcium and calories | Primarily for growing, pregnant or lactating animals when advised | Excess calories or minerals in an adult maintenance diet |
Fruit and carrots are treats, not daily staples
Small pieces of apple, grapes, berries, orange or carrot can be offered as occasional rewards. Their higher sugar content is the reason for the limit. UC Davis sets fruit at no more than 5% of daily food intake; Merck and Animal and Veterinary Service also describe fruit and other sugary items as limited foods.
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Give only a tiny piece at a time, remove uneaten fruit before it spoils, and never let treats replace hay or the daily vegetable portion. Avoid seeds, pits, stems and any fruit that is bruised, fermented or moldy.
Foods to avoid completely
| Food or situation | Why it is unsafe | What to do instead |
|---|---|---|
| Potatoes | Agriculture Victoria lists them among poisonous foods for guinea pigs. | Use grass hay and identified guinea-pig-safe vegetables. |
| Onions | Listed as poisonous by Agriculture Victoria. | Do not offer raw, cooked, powdered or mixed into leftovers. |
| Rhubarb leaves | Listed as poisonous by Agriculture Victoria. | Keep the plant and trimmings out of reach. |
| Oxalis clover | Listed as poisonous by Agriculture Victoria. | Prevent access to unidentified lawn plants. |
| Sugary yogurt-drop treats and similar confectionery | They add concentrated sugar and are not part of a guinea pig’s herbivorous diet. | Use a small piece of approved vegetable as a reward. |
| Unidentified wild plants | Misidentification, pesticides, fertilizers and contamination can all create risk. | Feed only plants positively identified as safe and clean. |
| Moldy, slimy or spoiled produce and hay | Can cause gastrointestinal illness. | Discard it and wash the bowl before refilling. |
How to introduce a new food safely
- Start with a healthy baseline. Make sure the guinea pig is eating hay and producing normal, firm droppings before adding a novelty food.
- Choose one new item. Do not introduce several vegetables on the same day; otherwise you cannot identify the cause of a reaction.
- Offer a small piece. Keep the familiar hay, water and produce available.
- Observe for at least a day. Watch appetite, stool size and consistency, abdominal comfort and energy.
- Increase gradually. If stools and appetite remain normal, add the food to the rotation in a modest portion.
- Remove leftovers after a few hours. Fresh produce spoils quickly in a warm enclosure.
Sudden changes can cause gastrointestinal upset, so even a food that is safe in principle should not be introduced as a large serving.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical daily routine
- Morning: refresh the water, remove damp hay and replenish an abundant supply of clean grass hay.
- Fresh-food meal: provide part of the day’s leafy greens and a vitamin-C-rich vegetable such as bell pepper. Wash and dry produce before serving.
- Pellet check: give the measured portion of plain, fresh guinea-pig pellets; do not top up an old bowl indefinitely.
- Evening: offer the remaining vegetables, inspect hay consumption and remove wilted leftovers.
- Treat occasions: substitute a tiny fruit or carrot piece for part of a reward, not for the hay or vegetable ration.
Keep the routine consistent, but rotate suitable greens so the diet is not dependent on one plant. A kitchen scale, measuring cup and simple food log can help identify changes in appetite or stool production.
Adjustments for age, pregnancy and illness
Growing, pregnant or lactating guinea pigs
These animals may need more energy and nutrients than an adult at maintenance. Merck notes that alfalfa hay or alfalfa-based pellets may be appropriate for these life stages. Because the correct balance depends on age, body condition and litter status, confirm the plan with a veterinarian rather than switching every adult to alfalfa.
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Adults
Healthy adults generally do best on unlimited grass hay, a small serving of plain timothy-based pellets, about 1–2 cups of varied fresh produce and a dependable vitamin-C source.
Older or ill guinea pigs
Dental disease, urinary problems, obesity and digestive disorders can change what is appropriate. A guinea pig that stops eating, develops diarrhea or becomes lethargic needs prompt veterinary attention. Do not try to correct those signs with extra fruit, force-feeding or vitamin-C water without professional instructions.
Common feeding mistakes and fixes
- Filling the bowl with pellets first: measure a small serving and make hay the food that is always available.
- Buying a colorful mixed feed: choose plain guinea-pig pellets without seeds, nuts or dried fruit.
- Relying on water additives for vitamin C: use fresh bell pepper and other greens; ask a veterinarian about a tablet or supplement when needed.
- Offering too much fruit or carrot: reserve tiny pieces for occasional treats and keep fruit under 5% of daily intake.
- Changing foods overnight: add one item at a time and increase portions slowly.
- Leaving produce in the cage all day: remove leftovers after a few hours to limit spoilage.
- Assuming every lawn plant is edible: feed only positively identified, uncontaminated plants.
When to call a veterinarian
Seek prompt veterinary care if a guinea pig stops eating, produces markedly fewer droppings, has diarrhea, appears painful or bloated, or becomes lethargic. Gastrointestinal problems can worsen quickly in a small herbivore. Bring the food list, pellet package and details of any new item or possible toxin exposure so the veterinarian can assess the cause.
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