 However, the fact that from what you're telling me, he does this Cujo imitation and gets so aggressive at that point, you may want to consider at least working with or having someone come into your home so that you can at least gain that control. See, when someone says to me they have a trained dog and the dog is trained when there's no distractions around it, the dog is trained when it's perfect, that's fine. But I want your dog to respond to you if there is a little dog around. So maybe you just need to reinforce the training a little bit so that you have more control of him.