Z-Bone dental bones feature an exclusive ridged surface, the polishing action of calcium carbonate, and the ideal density for longer cleaning time. The edible breath formula helps fight "doggy breath" with naturally powerful chlorophyll, plus a healthy blend of nutmeg, clove, parsley and fennel seed. Wheat and Corn free. Reg: for 2 -25 lb. dogs, LG: for 26 lb. and bigger dogs.