I read that, too!!! It made so much sense. http://www.peterdobias.com/communit...an-cause-disease-and-possibly-lead-to-cancer/ I cannot say I agree with training collars at all. My dogs wear flat, leather collars to keep their tags on. That's it. I use a slip lead or a harness/leash but a leash is ONLY for safety... it is not for training. I want my dog to behave me, not a collar. Imo, a training collar is counterproductive to teaching my dog to obey my commands. It's one more step to overcome to get to a naturally well behaved dog. Leashes and collars break, people make mistakes and drop leads. A dog who obeys you, and focuses on you over anything is a dog who is safe no matter what. Putting training collars on puppies is unimaginably lazy and careless. When a puppy is in their socialization window, the LAST thing you want to create is associations between painful collar corrections & seeing other dogs/people on walks. I'm not going to say that every dog in every situation doesn't need a training collar - but certainly no puppy deserves that kind of treatment, when they haven't even been given the chance to learn what you want from them.