Bitter Apple for Small Animals like Ferrets and Rabbits, Rats, Guinea Pigs. Apply topically to discourage small furry animals from chewing themselves and each other while caged. Apply topically to discourage small furry animals from chewing themselves and each other while caged. Bitter apple helps in ferret and dog training techniques, and promotes early weaning.. Water, Isopropanol 5%, Bitter Principles And Extractives.: Size: 8 OUNCES: Color: APPLE