Ive always been wondering about this subject as my moms dog show some of the same behaviours as a mentally ill person would show, so i did some research and yep, i think he is a very sick doggy... now just need to determine what i can do to take him out of his misery..

My brother has a cat like that. He'll be sitting there, cat in his arms, petting it, and the cat will look at him, sink his fangs in and bite hard enough to draw blood , growl scratch and bite hanging on until my brother shakes him off. The cat will then look at my brother rub against his leg and purr. My brother has so many scars on his arm and so many infections with antibiotics because of this cat but he loves him and won't get rid of him.