We recommend feeding your small animal a food that has been scientifically-formulated for your particular animal. Guinea pigs require a food formulated with appropriate levels of vitamin C or they will get scurvy and rabbits need a diet high in fiber. (Kaytee Fiesta Max Guinea Pig) Hamsters and gerbils do have similar nutritional needs and can eat the same foods. (Kaytee Forti-Diet Hamster) It is important to feed your small animal a diet that is scientifically formulated to provide the right nutrition for your small animal. If you have any questions about what to feed a small animal please Contact Us and we will be happy to assist you.