Hi guys! I have 4 cats and 2 dogs. My GSD, Hazel, was rescued, and she has an agression issue with cats. She used to bark like crazy, but she seems to have gotten better. We brought up a cat in a crate today, and she got rougu, attempting to bite a hole through the crate. Part of me thinks she just wants to play, but the other part screams aggressive behavior. I believe many have experience with this situation, as GSD's have high prey drives and chase cats commenly. Please help me out here. Thanks a million!