Hi all! I am new to this site and would like some suggestions on my rattie (Ollie). He is pure alpha male with a bad attitude. My husband & I got him when he was eight weeks old (before he learned about biting from his mom) & he is now just past 1 year. We recently had him nuetered. My husband & I have no children & we spoil him immensley. He does have a major problem though that is starting to concern me. He tends to bite me & has gone after my sister as well. He gets aggressive with certain people. Example: When someone goes past our patio window (we live in an apartment complex) Ollie runs over to the window and starts barking loudly & will not stop!!!! When the person comes into the building he runs back & forth from the front door to the window. If I try to go over to him and pick him up or tell him to stop he will bite my hand. --------This has happened a couple of times to me & he just recently bite my sister while she was visiting me. We have crate trained him & I have the crate between the window & door, but it is hard getting him in there when he is out of control. I have called my vet and asked him for suggestions. First he suggested a behavioral trainer. I thought about it and we can not afford this option. Sooooo, I called him again and this time he suggested a muzzle & D.A.P. which is like a plug in that throws of pheromones like a pup's mother. We purchased the muzzle & I am getting him used to it. I make hime wear it at least once a day while we take a walk together. He will need it at the vet's when we have his nails clipped from now on. I know he is a smart dog & can be trained. He knows how to sit & lay down-coaxed with a treat naturally.  Any other suggestions would be well appreciated. Thanks. Oliver's Mom.