Marlon and Lisa Grennan, the owners of Dark Dynasty K9s, breed and train dogs at their kennel in New Hampshire. They are known for being the parents of Hulk, a 175-pound pit bull. In early 2015, Hulk has been seen all over the media for his enormity. The same year, Hulk became a father to puppies worth $500,000.

Despite his intimidating size, Hulk is a friendly, gentle dog. And Jordan, their three-year-old son, allows Hulk to be around him when inside the home. Hulk and Jordan play, and sometimes, take baths together. The Grennans still train Hulk for security purposes and predict that he will weigh up to 200 pounds.