I mentioned this the other day in the fantasy section, discussing my fascination with pet play/animal transformation play from both a Dom and a sub role. I've been around dogs since I could walk, and saw and participated in obedience training from around the age of 8 through about my mid-teens. The parallels to D/s training in many ways are unreal. Granted, different activities (unless you are training your sub to jump over low fences, and retrieve dumbells... though if that turns your crank great for you!) but there are a lot of highly transferable things about the two.