[domininance]

for a companion/protection animal I vote for any of a number of Shepard breeds. German Shepard, Dutch Shepard, Belgian Malinois. BTW those are all common police dogs as well.

For police dog's/professional security dog's companionship is crucial, but typically they want the dog to retain some edge, so careful supervision is typically required when the dog is interacting with others. For a home protection pet much of the same training and skills police dogs have can and should be taught, but it is important that the dog can interact with others mostly unsupervised, and companionship is similarly crucial.

I'm not sure about the rest of the country but here in CA dogs really effect home owners insurance, so you need to choose breeds wisely. I love pits but many HOI's here wont even allow them, or charge crazy premiums.

I have a home protection cat.