Guinea pigs are herbivores and their diet should consist primarily of hay, fresh vegetables, and a small amount of pellets. Hay should make up the majority of their diet, and it is important to provide a variety of different types of hay to ensure that your guinea pig is getting all the nutrients they need. Fresh vegetables should be offered daily, and some good choices include romaine lettuce, carrots, bell peppers, and cucumbers. Pellets should be fed in small amounts, and it is important to choose a pellet that is specifically formulated for guinea pigs.
If you are unsure about what to feed your guinea pig, it is always best to consult with a veterinarian.