Sounds like you made the dog gunshy. Starting a pup to the gun correctly can make or break a dog. You do not take a dog on a walk and open fire for no reason. You start a dog in increments, the best way to do it is to have a second person, you get the dog interested in a bird on the ground and have the second person 30 or 40 yards away fire a 22 blank and watch the dogs reaction, if there is no reaction have the person move closer and do it again, continue closer and closer until you see the noise doesn't bother the dog. Then on another day, do the same thing with a small ga. shotgun starting far away and moving closer, then move up to a larger shotgun and eventually you shoot a bird over the dog and let him retrieve it. That will have the dog associate the shot with pleasure. Doing what you did, shooting for no reaso with a 22 and then taking the pup out and shooting over him was about the worst thing you could have done. You cannot rush introducing a dog to the gun. You should take the pup to a trainer and see if he can undo what you did, he may be able to or maybe not. If you do it right and take your time you get this:
