What is the largest dog breed? It is not so easy a question to answer as you might think. And while the biggest breed is debatable, there are many people who even more debatably claim to own the World's Largest Dog.

Below you find some 'possible' examples of the biggest dogs in the world. A lot of you might have seen these photos. We couldn't verify the sources so we leave it up to you to believe them or not. Photoshop can make look anything big. Let us know what you think. Have you seen any of these dogs in person? Do you have a photo that you want to share with us?

1) The Largest Great Dane:

Without doubt the Great Dane is one of the biggest dog breeds in the world. This one below is a harlequin Great Dane. According to the breed standard Great Danes' shoulder height is between 71-86cm or 28-34 inch. While they are huge and can easily be as high as the woman in the photo, it looks fake. The hind legs are way too long, longer than the back line.

The Largest Great Dane

2) The Largest Boerboel:

This South African Beast looks huge indeed. I am only guessing it is a Boerboel and I am also guessing... it is fake too! Males are 25-28 inches (64-70 cm.). Females are 23-25.5 inches (59-65 cm.). They are known to have huge heads... but this one is enormous!

The Largest Boerboel

3) The Largest Neapolitan Mastiff:

This is a Neapolitan Mastiff. Without any doubt, this is the worst fake World's Largest Dog Photo I have ever seen. While Neapolitan Mastiff is indeed a large breed and can weight over 200 pounds, they don't grow this big... or if they would they could not walk. There were probably two horses in this photo originally!

Largest Neapolitan Mastiff in the World

4) The Largest Irish Wolfhound:

Our next featured Largest Dog in the world is an Irish Wolfhound. Guess what?! I am sure this photo is not fake and shows the actual size of the dog. Although, I must admit that the photographer did a very good job to make it look bigger than it is. There is one thing we cannot be sure about though! Is it really the largest dog in the world??? Hard to tell... probably not but it does look huge!

Largest Irish Wolfhound in the World

5) The Largest Irish Wolfhound (2):

This next  featured largest dog is an Irish Wolfhound again. I have a feeling that this photo is real and the photographer picked a very good angle, which makes the dogs look larger. The dogs are in front of the camera while the little old lady sits on the couch in the background as a comparison.

Largest Irish Wolfound

6) The Largest Caucasian Mountain Dog:

Come on?!!! Is it really a question whether this photo is fake or not?! FAKE Yes, Caucasian Mountain Dogs are big and the size of their heads can be huge. And they can be just as dangerous for intruders as their size suggests. Take my advice and do not ever try to go close to a Caucasian Mountain Dog unless the owner is present.

According to the breed standard they weight 45-72kg. I believe you can easily find CMDs close to 90kg.

World's Largest Dog

7) The Largest Irish Wolfhound (3rd time):

Another Irish Wolfhound. What can I say... they are large dogs and yes, they can be this big. Look at the man leaning forward to support the dog. This photo is real and a nice illustration of how large this breed is. Nice dog!

Largest Irish Wolfhounds

8) The Largest Caucasian Mountain Dog (2):

The Caucasian is another breed which is frequently seen seen as one of the largest dogs in the world. By looking at the below photo, with the same effort you can make a Chihuahua look the largest dog in the world.

Largest Caucasian Mountain Dog

9) The Largest Irish Wolfhound (4th and final):

Another Irish Wolfhound. A dog? Is it a dog or a statue? Anyways, I let you decide. I think this photo is very funny.

Biggest Irish Wolfhound

10) The World's Largest Dog Ever?

And finally we have 'possibly' the World’s real largest dog..... The world's heaviest and longest dog ever recorded was an Old English Mastiff named Zorba. In 1989, Zorba weighed 343 lbs (156 Kg) and was 8 feet 3 inches ( 2meters, 51 cm ) long from nose to tail!

A perfect example of this mammoth-sized breed....

Mastiff