Strawberries are high in Vitamin C but they also contain around 5% sugar so they are safe for your guinea pig to eat if given in very small quantities, as an occasional treat, and include the tops/leaves if possible.
Although vitamin C is good for them and a very important part of a guinea pig’s daily diet, the sugar content is not. Sweet peppers have high levels of vitamin C but half the sugar compared to strawberries, so are a much better food for your cavy.
Fruit should always only be given in very small amounts and certainly not on a daily basis. Too much fruit will cause your guinea pigs to put on excess weight which is dangerous to their health. They can also experience upset tummies if given large amounts of strawberries as they have a delicate digestive system which prefers hay and fresh leaves and vegetables.
The green part of a strawberry is probably better for them than the fruit itself so if you’re having strawberries, pick the green tops off and give them to your guinea pigs.
However, strawberries are one of the worst plants for chemicals and pesticides. These are very dangerous to your pets so always give them an extra thorough wash before feeding them to your guinea pigs.
Below is the nutritional value per 100g of strawberries