[selzer]

Redirected aggression maybe.

I had a couple of bitches at my place that would have killed each other. They would fence fight, down and up, and after coming away from the fence, the one would grab a squeeky toy and squeek and shake the heck out of it. Once she grabbed a young male pup -- not hers. I was right there and she let go immedieately, but at that point I realized the fence fighting had to stop and put up a large tarp so they could not make faces at each other.

I think it was misplaced or re-directed aggression.