My question for everyone is what age should I start to use the e collar full time to re enforce training. My dog is a black male and he is 4 months old. I have been using the Hillman puppy program and in my opinion, he is doing great. To date he is sitting, staying put after I sit him, coming to here, starting to heel off lead, and holding. The heeling and holding are a little sketchy, but I figure it will come with repetition. I have had his collar on him to get used to it, but not used it yet. This is my first time training so I am just trying to read books, watch videos, and read these posts. I cant seem to find a starting age for formal training. All I can seem to find is no force fetching until the adult teeth are in. I have also been using the Hillman fetch video and that seems to be going pretty well also. Any and all help would be great. Thanks, Matt I am also planning on using the Lardy trt when I do start formal training.