Guinea pigs develop dietary preferences early in life and do not adapt readily to changes in type, appearance, or presentation of their food or water. The optimum diet for a guinea pig should contain guinea pig pellets, grass hay and supplemented with fresh vegetables. Guinea pigs are completely herbivorous and enjoy a variety of leafy greens. All fresh vegetables should only be left in the cage for a few hours and only a small amount of fruits should be offered. Good quality hay should be available at all times and pellets can be given free choice as well. Guinea pigs require a dietary source of Vitamin C and should be offered in the way of green leafy vegetables (kale, parsley, beet greens, chicory, spinach), red and green peppers, broccoli, tomatoes or small amount of kiwi and oranges. Make sure to speak to your veterinarian if you have questions about your guinea pig’s diet.