The largest dog in the world is the great dane
The world's largest dog breed is the Irish Wolfhound.
Largest is the English Mastiff, tallest is Irish Wolfhound.
Chihuahua is the smallest breed of Dog, whilst the Irish Wolfhound is the largest.
I am not so sure but the largest one I've seen are like bears.
follow this link for the pic - http://struckbyenlightning.files.wordpress.com/2009/10/worlds-largest-dog-hoax.jpg
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fat
diamon-shepper
A fat one
great dane
There is no current World's Largest Dog listed in the Guinness Book of Records. However, back in 1989 Zorba, an English Mastiff, tipped the scales at 343lbs and made it into the Guinness Book of Records. The English Mastiff is the largest breed of dog and the Irish Wolfhound the longest. In 2001, Joe Flynn's English Mastiff, Hercules, made the record book for heaviest dog at 282lbs. Gibson is the current longest dog at 8 feet and 3 inches.