Rottweilers are good. American bull dogs are good. Boxers are good (small, but really tough). These are all breeds derived from the mastiff, and they share a genetic characteristic -- the mastiff keeps what is his. They also tend to attack without barking, which is a useful trait. Or, if you want to spend $100+ dollars on meat every week, get a mastiff.
You want a great security dog? Get a giant or standard schnauzer or something like a bouvier de flandres. Akitas tend to be biters; a malamute is imposing and very protective. Most of the working breeds and the herding breeds are excellent dogs for protection. Some terriers will bite the shit out of you as most were bred to hunt varmits.
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