I know that is not the way to introduce a dog to the gun, I am not an expert trainer, but I have trained 3 labs a setter and on my second setter pup now and I bought a training video and read books to help me, there is a book called Waterdog by a guy named Wolters that a lot of people use as a guide. If you don't think you can do it alone you can always hire a trainer for a few sessions to get you started. A dog started wrong will be hard to bring back into line and a dog started wrong on the gun can be ruined. We all had to have our first traning session, slow and easy is the way to go and if you have doubts ask someone who knows, and you will get lots of suggestions on the internet, many of them wrong.