What is the world's largest dog?

Answers:
Its the english mastiff.

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It's a close fight between the Great Dane and the Irish Wolfhound.

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Irish wolfhound

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Gibson, the great dane...see link below.

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i think its the great dane, i saw the nations largest dog on oprah a few weeks ago

i think it was 7'2'' standing up[on 2 legs]

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St Bernard

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the largest dog breed by AKC standards is the Irish Wolfhound. now if you don't count people that overfeed their dogs, or breed abnormally large dogs just because they can. a fit, healthy dog of it's breed standard that should be the largest dog by height is the Irish Wolfhound.

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I think that Irish Wolfhounds are the tallest, they barely beat the Great Dane in the A.K.C. standard.
Irish Wolfhounds:
males-32+ inches, females-30+ inches
Great Danes:
males-30+ inches, females-28+ inches

As far as body weight goes, it's between the St. Bernard, Newfoundland, %26 Mastiff.
Mastiff: 175-190 Lbs.
Newfoundland: males 130-150 Lbs; females 100-120 Lbs.
St. Bernard: 120-200 Lbs.

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According to the pedigree website the Wolfhound is the biggest, but the mastiff %26 StBernard are the heaviest.
I've seen some very big Leonbergers though.

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The Irish Wolfhound is the tallest dog, it may not be the heaviest dog, but it is definately the tallest.

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St Bernard A full-grown male can weigh between 150 and 220 lb

Coming in 2nd would be the English Mastiff.

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Tallest : Irish Wolfhound

Heaviest: Mastiff

There is a very tall Great Dane recently, but on average these are correct.