Some good advice and some not so good advice.Curing a gunshy dog IS possible ,but like a few others have said its takes a good bit of time and Lots of patience.I'd have to ask the breeder where you got the dog if he tried shooting over it at a ridculous young age.The reason I say that is while you can get a timid of fairly shy dog,in 98% of gunshy dogs are from "Man Made Error".Pups are Not born gunshy,that happens from a mistake in training,perhaps trying to rush the dog to fast to gun introduction.

I introduce all my pups to the gun while on birds.Set a bird out let the dog find it and chase it up while the dog is in HOT pursuit and away about 100 yds I then fire the gun or have a friend along and when I think its far enough have him fire a shot so I can be Totally focused on the pups reaction to the shot.If the pup stops at the shot or turns and heads back to me we are DONE for the day with the gun.More play time and lots of priase, no more gunfire until another day.As you well know by now introduction to the gun is Critical and cant be done too fast,it has to be done gradually and over time.

The first step I'd take is have your pup at your side and TEASE the heck out of it with a live bird.Then toss the bird loose for the pup to chase,even catching a few and letting it play with the birds and possibly make a few retrives would be a great start,but with NO GUN,just pup and birds.When you have the pup chasing with great desire would I then try the gun again.Get it all FIRED up for the chase then turn the bird free and wait till the dog is hot after it and a GOOD distance from the gun then fire a shot.Before I'd even try the gun I would let the pup chase these birds for at least a few weeks to build its confidence.Keep the sessions short with perhaps 1-2 birds TOPS and time in the field about 45 min to a hr Tops again,so it doesnt get bored and stays focused at the fun at hand.Seeking professional help is excellent advice but again theres NO guarntee it can be cured.Some dogs can some can't thats just the way it is.The time and expense can get costly.I did read one time there are a few professional trainers that do guarntee success or you dont pay.Good Luck let us know how things work out.Happy Holidays,Jackson..