I have two dachshunds. One is a boy who is two, and a girl that is 6 months. My boy goes crazy when we give him one of those soft plastic squeaker toys, and we gave him one for the first time afew months ago. He guarded it for hours, and tried to bite our other dog for coming near him. He never acts like this, normally he behaves well. My wife yelled at him for being so aggressive to the other dog, and he is very sensitive. When he gets in trouble he sometimes pouts for afew days. After this incident he no longer has any interest in toys, and it's been a few months. What can I do?