Im 15 and my family have 4 beautiful dogs. Theyve all grown up in a loving and caring home, they are all HAPPY and cared for. They are not abused, and not neglected in any way. Theyve all been taught basic commands, even tricks and have been taught to listen when called but over the years my yellow lab has just suddenly started ignoring those. He has ALWAYS been a crazy hyper puppy, used to be just like Marley from Marley and me, and that was his personality we always loved him. But now not only is he hyper, he's starting to get aggressive with our other dogs. He growls NON STOP at the other dogs, even at nothin. If he happens to be laying next to a food bowl that's not even his, if the other dogs approach he growls. He also has SUCH A BAD problem with people coming home. This is something I can not stress enough. Whenever someone comes home, he goes INSANE! He jumps, barks his high pitched bark, whines, growls at the other dogs, an repeats. And that aggravates the other dogs so they always bark at him and that makes him growl or bark even louder and it's a huge mess. My other dogs are fine its just he recently got so bad. Spray bottles do not work, yelling at him does not work, even as a puppy training collars or even shock collars (last resort) does not affect him the slightest. He hurt his tail badly as a puppy and even then, the pain from it didnt stop him from being his hyper self. I know it's because hes happy to see us but it's getting to out of control, what can I do?