Certified by the Guiness Book of World Records, the world’s tallest dog is Gibson, a Harlequin Great Dane.
When he stands on his hind legs, the 170-pound Dane is more than 7 feet tall, taller than most NBA basketball players.
Gibson has an overwhelming gentle spirit and unconditional love for all. He loves riding in the “GIB-Mobile”, a 1983 Oldsmobile that has the back seat taken out of it with a big soft bed in its place. [link]
Canis familiaris (the domestic dog) shows extreme diversity in body size, unlike other mammals.
Differences among dogs seems to be regulated by a single variant of one gene which small dogs possess and large dogs lack.
The National Human Genome Research Institute published its findings in the journal Science after having studied DNA samples of over 3,000 dogs and 143 breeds.
dogs in the news has a one page photo essay about the biggest dog, tallest dog, shortest dog & smallest dog in the world.