The world's biggest breed of dog is the Great Dane. As of 2015, a Great Dane named Zeus, who stands 44 inches high at the shoulders, holds the world record for largest dog. More »

The American Kennel Club recognizes only one type of bullmastiff. Current breed standards call for heights of 24 to 27 inches and weights of 100 to 130 pounds. More » Pets & Animals Pets Dogs

The United Kennel Club, one of the leading authorities on dog breeds, considers the biggest American Pit Bull Terrier to weigh 60 pounds and to measure 21 inches tall at the shoulders. The club does not consider a dog la... More » Pets & Animals Pets Dogs

The Great Dane is the largest dog breed, according to the Conservation Institute and The world record holder for tallest dog is the Great Dane Zeus, who died in September 2014 at age 5. He was 44 inches tall a... More » Pets & Animals Pets Dogs

The largest dog breed in terms of height, measured at the shoulder, is the Great Dane. When it comes to mass, however, the English Mastiff is the biggest. More » Pets & Animals Pets Dogs

The fastest dog breed in the world is the greyhound. Greyhound dogs can reach speeds up to 45 miles per hour with unsubstantiated reports of exceptional greyhounds reaching more than 50 miles per hour. More »

The Greyhound is the fastest breed of dog in the world. The Greyhound has been known to reach speeds of up to 45 miles per hour. Other dogs that rank about as fast as a Greyhound include Whippets, Vizlas, Weimaraners, Sa... More » Pets & Animals Pets Dogs