I purchased Invisible Fence Brand from a company out of Raleigh. Put the flags up and took her to each one. I think she got zapped 1 or 2 times. Long story short I don't even keep the collar on her anymore. I can take the flags with us when we go camping and she will not go pass them. I don't think he is to old to train. Just don't make him mad. I would hate for him to end up on top of you. I know how big he is.

BUZZZZ