An excellent chew for all dog sizes. Made of whole thick slabs of sweet potato, dehydrated. The chews have a hard surface, excellent for dental health, and a chewability that dogs love. Smaller breeds will chew these for fifteen to twenty five minutes. Medium to larger sized dogs will chew them faster, of course. All Sam’s Yams Dog Chews are particularly well suited for senior dogs whose teeth and gums are more sensitive.