I'm sorry to hear you are having such a difficult time with "this dog". But I totally understand. It will take a lot of time and training in order to control a strong predatory instinct. And it won't be fast. Some dogs, such as the one I have, want to eat every bug, bird, squirrel, or anything that moves. Even though he listens when I call him, he will try and test the limits. Especially when a stupid squirrel decides it will gingerly cross two feet in front of him. There are two suggestions I have, one is putting a good deal of time and effort into the training and establishing yourself as a leader, or using a training collar. If you want almost instant results, use a training collar. Used correctly, a training collar will work and prevent your dog from killing anything else. It's not cruel, nor mean, and once it's used a few times, you probably won't need it. Read up on them. Training collars have come a long way since they were invented. Most people that hate them don't do the research. Hope this helps, best wishes.