Lukas was my old Jack Russell. He was about a year old. We got him when he was a little puppy. He was five weeks old. I guess I blame myself because Jack Russell's are very energetic dogs and I guess I didn't walk him enough. Well he got to agressive and since there are little kids, we had to give him away. I cried all that day. But we put him in a shelter where they don't kill the dogs. and still he is there. It's only been like 5 months or so,maybe more.