This bug isn’t a much important one

I was hunting with one of my tamed dogs and I started seing that he started to walk backward or attack the animal backward. Then I took a other of my dog and started seeing that he was sometimes doing that too. 

Ways to reproduce this:

• have a dog with you then punch a animal and he should sometimes/ rarely walk/ attack backwards.

 Other thing: It looks like the dog is slapping the animal with his back.