Rasta won't curl back his lip or show teeth I've never seen him do it. It's more like a "look at me! Look at me!" type of thing. His tail does not wag when he does the nipping. My bulldog is the alpha of the two I feed her first, give her treats first, etc. They are not allowed to be together unless I'm in the same room with them. Rasta does try to take toys out of my bulldogs mouth on occasion and that's when she will headbutt(nudge) him. So this is normal play interaction? That's good to know
