The Mastiff
The mastiff is the best of all guards; it is more pure instinct with him to guard his master's property than it is with any other breed. He is honest through and through, and as a rule he is gentle and a good companion.
The Bull-Dog
The bull-dog is stupid and not particularly affectionate. Although excitable he is not quarrelsome or savage, and if reasonably treated no doubt would make a quiet, faithful pet. A not too highly bred bull-dog is likely to be more intelligent than his very blue-blooded relations.
The St. Bernard
The most majestic of dogs is the St. Bernard. He is high-couraged and sagacious and very discriminating in his devotion. Once your friend, he is always your friend. Although with you he never makes a mistake, he is apt to growl at strangers, and is not to be relied on to be polite to visitors. If you have one of the rough-coated variety you must groom him regularly and take great care of him, as he is a delicate dog and subject to weakness in the back and hind legs if he is allowed to get wet or lie on damp ground.
The Great Dane
The Great Dane, or boarhound, is a powerful and active dog. His appearance is suggestive almost of a wild beast, and he is particularly well fitted to act as guard. He is gentle and manageable with those he knows, and his great courage, intelligence, and strength make him a most desirable companion.