My dog is really....?

ok it really will depend on the breed. it sounds like a sporting breed. your dog sounds like he is not being exercised enough. take him for longer walks, that will help with the problem. he is probably bored. He is also a puppy and needs to be trained. be patient. the dog will mature but you need to daily walk the dog, and gte into training. then watch as your problem dog MAGICALLY changes. lol