Black Russian Terrier
The Black Russian Terrier is powerful shaggy dog that is full of energy but can also be quite calm after getting enough exercise. They require firm training, but that’s also what makes them so intimidating to strangers. These are protector dogs through and through, as they were bred for it.
Boxer
According to the American Kennel Club, the Boxer is the perfect balance between hard working and fun loving. One of the most popular dog breeds, boxers are naturally curious and silly, which make them great pets. They’re also protective and courageous, making them excellent guard dogs.