My ex boyfriends sister had two rat terriers both hyper as heck. When it got free a couple times it headed straight for the ducks and chickens and there was no stopping it. It killed a duck and a chicken. She kept it chained and it dug under a fence near by and got strangled, sad. It was just so darn hyper, those guys really need training...well all dogs do. Its sad and I am sorry for your loss.