Hey Guys,
My four month old lab was doing really well retrieving puppy bumpers but started to want to take off with the bumper instead of bringing it back to me. Now I only throw bumpers when he's on the check cord. Sometimes he brings them back pretty well but other times he gets interested in playing with the slack in the cord between me and him and drops the bumper to play with the cord. What do I need to do to correct this ?