dog might be having some slight gun shyness

[theduke]

just wonder how can i solve a slight gun shyness in my dog. heres what happen, took the pup out just for a lil shooting nothing big we've done it a few times with him so he is pretty familar with the gun, even the first time i took him out at 14 weeks he did not care.then took him to shoot birds he did not care he loved it actually. then today he was a lil uneasy. what we did today was throw the bumper shot and he got it. but in the process when he heard the shot he was uneasy. the good thing is he did not run away just came back to me. but when we did it the third time he didnt want to go, but still didnt take off just sat beside me. now a few factors i think to casue this was i didnt make it fun enough, or he was having one of those days(he's a chessie they think there pepole) but tell me what u guys think, nd what can i do, im thinking of buying a cheap cap gun to use temp for my trainings?