Meet Hulk, a 17 month old bully pit bull weighing around 175 lbs and he's not even finished growing yet.

The video, which racked up more than a million views in its first week, left many viewers wondering if The Hulk really was the world's largest pit bull. While there is no official size record for pit bulls, many aspects of The Hulk's size are truly amazing. 

First, Dark Dynasty K9's (DDK9), a specialty breeder of large security dogs, credits The Hulk's massive size to his bloodline. The kennel's web site explains the dog's pedigree and traces the Hulk's ancestry back five generations:

"What is a bloodline?" is a very popular question and one that can be debated. To us at DDK it is the ability to create a consistent look. All bloodlines start off by selectively in and out breeding with a number of other bloodlines to create the style you are looking for. In time you should start to see a consistency in the production of the dogs. Here at DDK we are known for XXXL working style American Bullies that stand from any other bloodline by the look and the drive to work and protect. Like all other creators of bloodlines, we have a vision and started the long selective process to say "I have created a look that is different and distinguished". We give full credit to all bloodlines used to create the DDKLINE: Camelot, Petersons, Mcenna, Razors Edge, Gotti, Watchdog, Grayline, Red Lion, Dagger, Chevy...and the list goes on. In the past 8 years of breeding we could fill a whole page with the direct bloodlines used to create DDK in the past 8 years, as well as the bloodlines used to create those bloodlines; and with the proper research all this information is available. By selectively choosing dogs the DDKLINE was born and is here to stay.

While the video of The Hulk may seem incredible, DDK9 has dozens of additional photographs documenting the pit bull's massive size. This dog is only 17 months old and may still be growing. 

The Hulk may look scary, but DDK9 insists he is a sweetheart. The breeder says while its dogs are bred primarily for security, they are also great family dogs.