Dog Health Questions: Dog Training Collars?

Does anyone have any positive experiences with dog training collars? I don't mean the shock collars (I would never do that to my doggie), I mean either the one the the Dog Whisperer uses.
Thanks in advance! =]

Dog Training - Beyond Conditioning

Recommended Answer:
Don't spend the money on cesar milans crap.

Get any training collar from the local petstore. The trainers there will show you how to use it.