Well, my sweet, funny, energetic boy is being very aggressive with my 70lb dog. He runs at him biting his legs. I have 2 large dogs. He only does this with my older dog. My dogs could care less about the ducks. They are very mellow. Franco will come in the house jump on the couch on the dog and start biting him. It's for no reason. My dog gave him a warning nip once which just made Franco's aggression worse. I'm afraid I don't get this under control I'll eventually have a dead duck. He only does this to my older dog. He seems comfortable with the other dog. Oh, I also don't leave the ducks alone with the dogs but my drake likes to come in the house. What should I do?