My puppy acts really wild for someone reason and it worries me because he starts jumping on me or on my other relatives and growls,barks, and even bite like if he is aggressive. When i try to get close to him to calm him down or grab his leash, he goes in a position like hes going to pounce on something and starts running everywhere. I don't know what to do!, he has never done this before and it really worries me because i don't want him to be like this when he grows older! Please any suggestions, thoughts anything, that can stop this behavior so i wont have fear on him. (Hes 6 month and i don't know his breed)