Zukes PowerBones are the #1 selling performance treat in the world. Formulated with an optimal balance of performance nutrients including a premium blend of high quality protein for strong muscles and complex carbohydrates for energy, Zukes PowerBones help supply hard working and active dogs with the energy and nutrients their bodies demand. Whether hiking, biking, jogging, swimming, or competing in flyball tournaments, dogs of every size, shape and physical condition have run faster and lasted longer during activities because of PowerBones.