I have a 6-month-old chocolate lab and at 4-5 months he was retrieving the dummy (with a pheasant wing attached), getting in the truck and coming on command. On a daily basis I take him out to the field every day for a couple of hours where I work on retrieving, various commands such as stay, come, sit, and also let him run around to let of some steam and enjoy being a pup. I limit the training down to about 15 min or until he looses interest. All was going perfect until I threw in a dead pheasant. He retrieved it a couple of times and then stopped to chew on it. I then went away from it and back to the dummy. Then we were hammered with about 21 inches of snow and during this month he spent majority of the time walking and playing in it during our trips to the field. Now a month has gone by and he will run off with the dummy, won't get in the truck, and won't come back on command. Is he still to young? Should I use treats? I'm going back to the basics and will have to whip out the check cord, but just worried that he may not be interested in hunting or I'm doing a poor job of training. This is my first hunting dog. When do you decide if he needs professional training or a shock collar?