We rescued a pitbull terrier from a lady who got him from animal control. Were not 100% sure of his age one vet said 1 another said 3 years old. We don't know much about his history as he was found running around outside and wasn't claimed by anyone at animal control. Hes an amazing dog inside, very loving, cuddly and wants to be with you all the time but outside he turns into a completely different dog. He barks, tries to jump the fence, attacks everything that moves, runs like a maniac and will nip badly when you attempt to play with him. I have read everywhere about how to handle the nipping and exercising but nothing seems to be helping. it actually seems to be getting worse....he now will growl and put heckles up at times when he nips and if you try the ignoring tactic and walk away he will come up behind you and nip the back of your legs quite hard. My 5 year old son isn't able to play with him either which is heartbreaking as we wanted them to be buddies. I take him on long walks, which is a struggle as well as he doesn't like his leash, and i exercise him 6-8 times a day and try burn up as much energy as possible. He is also very very stubborn and thinks everything is a game.... I'm a bit beside myself as i feel like i'm doing everything advised and nothings helping...any help or advice would be greatly appreciated!!