Hey guys! I need help and quick. Psi is an 8 month old neutered male boxer. He has started displaying very aggressive behavior. I don't think he is trying to hurt me but he has started biting me. I have been the nurturer in the family and my husband is the disciplinary figure. I scold Psi as well but not to the degree my husband does. Anyway, the past two months have been really bad. Psi has started biting me. The first accurance happened during his training session. IT was the first day and the trainer had all of the dogs sit with their owner on a leash while she gave an orientation. Psi began to bite on my wrist and then jump up on me and growling. Afterwards the trainer told me that she felt Psi was overly stimulated and might benefit more from a personal training class. So we have started him with that class. BUT he has continued with this biting behavior. On Saturday during the training session he ran over and started biting my coat and pulling it while he was growling. When the trainer saw this she asked me does he do that often. I told her ever since that first class. I tell him No firmly and if he persist, I will put him in a time out. But the behavior is not stopping. She tried to teach me different things to stop the behavior (like telling him to sit) but it didn't work. Then she told me to get tough with him and hold him by his collar but his aggressive behavior escalated. I don't know what to do. I love him so and am trying everything to curb this behavior. He is also barking at us alot and destroying things right in front of us. He peed on the bedroom carpet this morning (something he never does) and my husband is at his wits end. The trainer suggest that we need to teach Psi how to be calm. He is an overly energetic boxer that is appearing to throw temper tantrums on a regular. I don't know what I have done to make him behave this way but the larger he gets, the more he is capable of hurting me. Please help!