Border Collie
If your “home” happens to be more of a homestead, you couldn’t ask for a better protector than a Border Collie. Fueled by regular activity and wide open spaces, the Border Collie has been used by sheep farmers for ages as an excellent herder.
Their whip-smart intelligence makes them great dogs for training – so you can instill the behaviors you need in a guard dog, and not the ones you don’t.