I did mine myself, took a throwing bumper, small one put a wing on it toss it for the dog. as soon as he picks it say HOLD when he drops it and runs off go stand next to the bumper call him back at a sit and heel position. open his mouth insert bumper, put your thumb in his ear and role the ear forward (TWISTING) saying HOLD every time he is trying to drop it, with the other hand tap the bottom of his jaw everytime you notice he is loosening say hold. spend about 30sec to a minute doing this. pretty soon he won't want to put it down. remember lots of praise take the wing off throw the bumper and let him have some fun, keep the training short and happy (AND REMEMBER THE HAND IS FOR LOVE NOT BEATING) Hit me up if you need some help, a trainer showed me how to do it. It's hard when you love your pet but it's worth it.