I hate to be this guy as an avid dog lover. The last two dogs I adopted I found on Craigslist years ago. They where from the same litter. I figured let me take two of them so they always have a friend. One dog turned out to be the best dog ever! Couldn't dream of finding a better dog! I could let him off the leash, call him to me, he even learned how to catch a Frisbee. The other one was an absolute menace! He would constantly attack the other dog. Really bad! I'm talking lock his jaws on his neck and not let go bad! He listened to me for a little. Then one night I was sleeping with him on the bed, I simply rolled over and he snapped and lunged for my neck. I thought ok maybe he had a bad dream. A few weeks later I came home to find him with a death grip around my other dogs neck. I'm talking a gruesome scene! It was literally a blood bath! There was blood 4 feet in the air on my walls! Looked like a murder movie! The other dog barely survived. I tried to have multiple experts fix him. Nobody could change his behavior. Little kids he would lunge at and and try to kill. Other dogs he woumd triy to kill. No matter how much money I spent or how hard I tried I could not change his behavior. I had to take him to a shelter and I just know he was one of those dogs. It still breaks my heart to this day. Sometimes though you get a Jeffrey Dahmer dog and can't do anything about it! I'm NOT saying this was the case with this dog. All I am saying is, sometimes this actually might be the case where this is necessary?