I use the air rifle & just get someone to throw an object for pup to run to ie,sock glove rabbit fur pigeon wing etc and fuss the pup up it then associates the firing stick as fun! then later on 4-5 months I take out over fields when a mate is pigeon shooting & just hang a good distance back always watching pups reactions to gun fire & proceed from there as is necessary-billy ps never rush things as a gun shy dog is hard to remedy