Can any one tell me is a choke chain harmful to my dog?

I think it really depends on the personality of your dog. I had a dog who would not learn. Choke chains were an absolutely no-no with her, because she would pull and choke herself until she nearly passed out or threw up. She never learned that if she'd stop pulling, it would stop choking her. If your dog is a little less strong-willed, then it probably won't do any damage. I would definitely play it by ear.

It doesn't hurt the dogs. My mom and brother uses one on his dog. It keeps them from pulling on the leash too hard and teaches the dog to listen to you. They work really well for my brother.