I'm so sorry for the loss of your dog. As hard as it may be,it was the right thing to do. I remember being terrified of my best friend's beagle when I was in elementary school. He would bite lots of kids and her parents said that the kids were not being nice to it. One day her dad went to pet him, he bit for no reason, he took it that day to be put down. He felt terrible that he hadn't belived his kids all along.