Offer a dog and treat and this happens:  “Hey! That smells great. I want that. I want that now. Really! Are you hearing me? I NEED that right now (shifts weight rapidly from one foot to the other). What part of now don’t you understand? Look at me. I’m hopping up and down. Now I’m bumping you with my nose. Seriously? Do I need to growl? You need to let go of that treat. It needs to be in my mouth NOW.”

Offer a treat to a cat and this happens:  “Hmmm? Smells interesting, but I don’t know. Maybe if I knew a little more about it. Wait. Do I have to do something in order to get this treat? Because, you know, I’m not really into that sort of thing (squinting eyes to mere slits). Still, it smells kind of good. Maybe if I walk away and seem uninterested, the human will just give it to me. Yup, I think I’ll try that.”