
As a pet owner, it is important to understand your pet's nutritional needs to ensure their health and happiness. Guinea pigs are herbivores, and their diet should be high in fibre and vitamins, especially vitamin C, as they cannot produce it themselves. A balanced diet for a guinea pig should consist of a constant supply of hay and grass, with a small portion of pellets and fresh food. Hay and grass help to wear down their constantly growing teeth and provide fibre for a healthy digestive system. Fresh greens such as kale, pak choi, cabbage, and fruits like bananas are also a good source of vitamin C. It is important to introduce new foods gradually and monitor their weight and droppings to ensure your guinea pig is receiving a balanced diet.
| Characteristics | Values |
|---|---|
| Diet composition | 85-90% good quality hay |
| Fresh grass | |
| Small portions of pellets | |
| Fresh greens | |
| Fruits and vegetables | |
| High in fibre | |
| High in vitamins (especially vitamin C) | |
| Dental health | Hay helps wear down teeth |
| Hay prevents dental issues | |
| Hay prevents overgrown teeth | |
| Calcium | Feed in moderation |
| Food quantity | Depends on age, lifestyle, and general health |
| Avoid overfeeding | |
| New foods | Introduce gradually over 2-4 weeks |
| Monitor for signs of tummy upset |
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What You'll Learn

Hay is essential
Hay is an essential part of a guinea pig's diet. As natural grazers, guinea pigs should have access to an unlimited supply of hay and grass. Hay should make up 80-90% of their diet. Guinea pigs are herbivores, and in the wild, they would spend a lot of their time foraging for fresh grass and plants.
Hay is crucial for a guinea pig's digestive system to function properly. It is also essential for maintaining good dental health. Guinea pigs' teeth never stop growing, and eating hay helps to wear them down and keep them at the correct length and shape. Without hay, their teeth will overgrow, causing discomfort and potentially stopping them from eating.
Guinea pigs need a very high-fibre diet, and hay is the best way to ensure they get enough fibre. Fibre keeps their digestive systems healthy and their guts moving. It also helps to prevent bladder stones, a common condition in guinea pigs.
Good quality feeding hay should be provided. Timothy hay is a great option. It is important to avoid lawnmower clippings, as these can quickly ferment and make guinea pigs unwell.
Hay can also be used to encourage natural foraging behaviour. Scatter large piles of hay and grass throughout your guinea pig's living space.
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Grass and greens
Hay is also a vital component of a guinea pig's diet, providing essential nutrition with high levels of vitamin C and fibre. The ideal diet for a guinea pig consists of 85-90% hay, so they should always have plenty available. Timothy hay is a great option, providing an excellent balance of nutrients, but meadow hay and orchard hay are also suitable. Hay helps to keep their teeth filed down, preventing dental issues, and is crucial for maintaining a healthy digestive system.
In addition to grass and hay, guinea pigs benefit from a small daily amount of fresh greens, such as kale, romaine lettuce, pak choi, and cabbage. These provide them with vitamin C, which they can't produce themselves, and other important nutrients. It's recommended to give them about a teacup full of greens each day, alternating between different types.
Pellets can also be included in a guinea pig's diet, but they should never be the main component. Grass-based pellets are the best option, providing essential nutrients like vitamin C. Guinea pigs only need a small amount of pellets—about one tablespoon per adult guinea pig per day.
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Pellets and supplements
Pellets are a great way to supplement your guinea pig's diet, but they should never make up the majority of their meal. A small amount of pellets each day—about one to two tablespoons per adult guinea pig—is sufficient to provide essential nutrients like vitamin C. It is important to choose grass-based pellets specifically formulated for guinea pigs, ensuring they are a consistent shape and colour to prevent selective eating.
When introducing pellets, do so slowly over two to four weeks to avoid tummy upsets. Mix a small amount of pellets with their current food, gradually increasing the amount while reducing their previous food until they have fully adjusted. This gradual approach is crucial for any dietary changes and the introduction of new foods.
Vitamin C is a critical component of a guinea pig's diet, as they cannot produce it themselves. While a balanced diet with fresh greens should provide sufficient vitamin C, supplements can be given daily on or with their food. Avoid vitamin C supplements in water, as sunlight weakens the vitamin, and the taste may deter guinea pigs from drinking.
It is important to monitor your guinea pig's weight and observe their eating habits. Consult a veterinarian if you notice any changes in their eating, drinking, or toilet habits. Obesity can negatively impact their health and quality of life, so ensuring a balanced diet and proper portions is essential.
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Vitamins and minerals
Hay is an essential part of a guinea pig's diet, providing them with the vitamins and minerals they need to stay healthy. Good quality Timothy Hay is an excellent source of nutrition, with long stems and a fresh smell. It should be green, and not brown, dusty or bitty. Hay should make up around 80-90% of a guinea pig's diet and must always be readily available.
Guinea pigs also need vitamin C in their diet as they cannot produce it themselves. This can be provided through fresh greens, such as kale, pak choi, cabbage and romaine lettuce, and some fruits such as banana. Vitamin C supplements can also be added to their food.
It is important to be mindful of calcium when feeding guinea pigs. While it is an important nutrient, it should be fed in moderation as a high-calcium diet can lead to bladder stones.
Pellets can be given to guinea pigs but should only be a small part of their diet. Grass-based pellets are the best option, with no more than one tablespoon given per day.
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Weight and health
A guinea pig's weight is a good indicator of its health. It is important to monitor their weight to ensure they are not becoming underweight or overweight. The quantity of food they need depends on their age, lifestyle, and general health. Overweight guinea pigs may suffer if they are eating more than they need. Obesity negatively impacts their health, welfare, and quality of life.
To prevent weight gain, it is important to adjust their feeding quantities. Avoid overfeeding your guinea pig with calcium-rich foods, as a high-calcium diet is more likely to cause bladder stones. Introduce new foods gradually over two to four weeks to avoid upsetting their stomachs. Monitor the amount they eat and drink, and keep an eye on their droppings. Consult your vet immediately if you notice any changes in their eating, drinking, or toilet habits.
A balanced diet is essential to keeping your guinea pig healthy. Their diet should be high in fibre and vitamins, especially vitamin C, as they cannot produce it themselves. A diet rich in vitamin C helps maintain healthy skin, joints, and blood vessels. Guinea pigs are prone to vitamin C deficiency, also known as scurvy, which can be dangerous for their health.
Hay is an important part of a guinea pig's diet, providing essential nutrition with high levels of vitamin C and fibre. It also helps keep their teeth filed down to a healthy length. Fresh grass is another crucial component of their diet, providing necessary nutrients. Guinea pigs should have access to hay and grass at all times, with hay making up about 80-90% of their diet. Timothy hay is a great option, providing an excellent balance of nutrients and a delicious taste.
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Frequently asked questions
A balanced diet for a guinea pig consists of high-quality hay, grass, and a small number of pellets. Guinea pigs also need fresh greens and vegetables to get enough vitamin C.
Timothy hay is a great option as it provides a good balance of nutrients and is delicious. You can also feed your guinea pig meadow hay or orchard hay.
The amount of food a guinea pig needs depends on their age, lifestyle, and general health. You should adjust their food quantities to prevent them from becoming underweight or overweight.











































