Seems to be some jealousy going on. How old are they? Are they spayed?
I have a boy and a girl, and when they were young, they were both on equal ground. One day my boy turned vicious. He would attack Roxy for toys, treats and food. I bought some books from dogwise.com - started to train them a little better, took them for walks together. Now at 4 yrs old they are much much better. TJ will still attack - but it is mostly in the middle of the night, no idea what or why he does that
