With the strength in his jaws to crush a man's arm like a toothpick, 175-pound Hulk is a trusted family member and a teddy bear with this couple's young toddler.

Marlon and Lisa Grennan breed dogs in New Hampshire and specialize in pit bulls. They provide trained dogs to high profile clients. The family has a 150-acre ranch that is home to them and their young son, 12 pit bulls and one chihuahua.

They have 100 percent confidence in the safety of their 3-year-old son, Jordan, when he is with Hulk.