I give the large ones to my big sheltie, Cody (42 pounds) and the smaller (regular size) ones to my little guy, Jesse (13.5 pounds). I cut the little ones in half for my pom (7.5 pounds). The good thing about them is that if they do swallow them whole, they are completely digestible and won't choke on them, they just go down their throat. I am continually amazed at what dogs are capable of swallowing. All three of mine are agressive chewers (especially the pom). Toys don't last but a few minutes in my house. The Beams last about an hour. It is something good to give them to preoccupy them when I am trying to work on the computer and I need them to settle down.