I think I may need a training collar for our dog. We have a Pyr puppy, he is seven month old now, and we also have three other large dogs. The Pyrenees is kind of hard to control but the biggest problem is that he will chase a deer, not listen, and in no time he'll be miles away. He comes back all right but it is illegal here and he can be shot for that just like his older brother was last spring.

What kind of shock collar do I need, what features should I be looking for, how much to spend? What are your experiences?