I have Deutsche dogge, German Shepherd, and Husky in my mind, how is that? (Let me know if you have a better idea!)

The best guard dog is one that attracts attention. Get a sm one that yaps a lot lots of noise attracts unwanted attention. Yes believe it or not go small.

Dog's are meant to man's best friend and not house best friend. Unless your dog are trained to be aggresive, then the best option is to install security system... Don' t use your dog as a shield.