One of the hardest dogs in the world, the Mastiff is enormous and weighs 200 pounds or more.
The Wolfhound has hunted huge Irish elk, which measured six feet at the shoulder.On his hind legs, he can make you look up.
When threatened, the Presa Canario is vicious.
Sled dogs are strong, athletic, and able to plunge in for the long run. Basically, the Siberian Husky.
The tallest dog in the world is lean. The Great Dane is one of the hardest dogs. Best home guardian and nice huge giant.
Not everyone can fit the Big Red Dog. Your apartment or yard may be small. You want a tough dog at your side. Meet the Jack Russell Terrier.
Boxers have always been working dogs. One of the toughest canine breeds, the modern bulldog is patient, protective, and pound-for-pound.
Be careful around the 150-pound, 27-inch dog. The biggest Newfoundland weighed 260 pounds and was six feet long.
Smarts and fearlessness make them great danger-taking buddies. It's no surprise that German Shepherds are among the toughest dogs.
With those wide eyes, the Chihuahua may look scared, but she's ready to fight anyone who crosses her path. Her loyalty makes her highly protective of family.