If you’ve ever seen a Mastiff, you’ll agree that there is one word that can properly size up its appearance: powerful. No kidding, this dog is huge — not as tall as a Great Dane, but probably twice as thick. Fittingly, this large dog breed makes an excellent guardian. However, though the Mastiff seems beast-like, it is surprisingly gentle, affectionate, and extremely loyal. Its devotion to its owners and patience with children have secured its popularity for years.