Definitely. In addition to a good fortified pellet and unlimited grass hay, guinea pigs require about 1 cup of veg per day. Mostly leafy greens like red/green/romaine lettuce, cilantro, parsley, kale, endive, dandelion greens. Also bell peppers, corn husks. Baby carrots and fruits like cucumber, apples, tomatoes, grapes, berries, watermelon should be given less frequently, as a treat.