I got a two year old half blue healer half German Shepard female dog from the shelter. We have had her for three months. She has attacked our seven yr old rat terrier/chihuahua three times as of tonight. First time she bit him he had a jacket on so we thought it was the jacket. Second time they were outside and she bit him on the neck and back. Left huge puncture wounds that I super glued. Tonight we were going to bed and she just ran over and bit him when he was sleeping. She's a herding dog so she tries to herd our four cats which doesn't work out that well for her. I really love my dog but maybe it's time to find a new home I'm not sure what to do. If you have any answers please let me know! Thank you