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Providing your guinea pig with fresh fruits once in a while will help spice up her diet. However, just like humans, guinea pigs shouldn't have too much sugar, so only feed her fruit two or three times a week. You can provide your guinea pig fresh fruit such as oranges, pears, strawberries, seedless grapes, and  blueberries. You can be a bit more liberal with vegetables, since most of them have less sugar than fruits. You can offer a small handful to your guinea pig once a day. Some vegetables to try include cucumbers, peas, carrots, and corn. That is, parts of vegetables you might normally throw away are fine to feed to your pet, such as strawberry tops and celery leaves. Always make sure that the fruit or vegetable is on the safe list before feeding it to her, though. Your guinea pig can have some human foods, but many foods are off-limits, such as salty snacks, chewy snacks, sugar-filled snacks (including chocolate), and other processed foods. You also want to avoid rhubarb, garlic and onions, raw or dried beans, and seeds. Chips or pretzels are too salty for your pet. Additionally, chips can be sharp and cut your guinea pig's mouth.

Summary:
Give your guinea pig fresh fruits. Offer vegetables. Give your guinea pig your food trash. Know what snacks are off limits.