I would wait until the pup is around 15 weeks old....take him to the trap range and get him out of the truck about 100 yds away and play fetch with him...gradually work your way closer....once you get close enough that he looks up when the guns are fired, stay at that distance and continue fetch....once he is able to ignore, move closer....in about 2 or 3 sessions, you will have him nearly to the shooting line...
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