Hi. I really need help. We've had our Beagle for over a year. He is a rescue. He is extremely attached to me but has bitten my father 3 times and growls at my 12 year old son. Things are mild now that he is on anti anxiety medicine and my father NEVER initiates contact with him. It breaks my heart thinking about finding him a new home. I am not the primary care taker. The vet put him on meds, we had a trainer (6 times, each for 1 hour sessions), we socialize him at the dog park and Petsmart camp once a week, and took him for a study at a University in Philadelphia. I would hate for my son to continue to be afraid to be near him. Is there a way for maybe my father to establish a dominant position with my Beagle? Can dog behavior really change? I don't fear him biting my son because his whole demeanor is different around my father than when he's around my son. I'm sorry for the long post but I am very discouraged and my Beagle is like my 2nd son, I can't imagine a life without him! Any help or advice would be greatly valued! Thank you everyone.