So I have 2 females a 4 yr old and a 1 year old. The 4 yr old got along with the puppy until the puppy cried out. This caused my 4 year old to attack her. Now she attacks the puppy without any warning whatsoever. I am wondering if this is prey aggression?? She killed and ate baby bunnies a few years back and that was a very traumatic event for her in how we responded. I don't know how I'll ever get this out of her. Tips and suggestions would be much appreciated!