My 2 giant black cats are sleeping on the bed, right next to me. The bigger one suddenly lifts his head, makes this annoyed and complain-y mreow, gets up, and bites the other cat on the back of the neck. I loudly said his name, he looked guilty, let go, and went and curled up and went back to sleep. The other cat just kind of glared at him and turned his back.

I know that this sort of thing can be dominant behavior, but the one doing the biting is definitely not the alpha. Is the other guy trying to take that position? Or is he just being an ass?

Cats are weird.