Giant 'Pit Bull' Has Puppies And It's All Kinds Of Wrong

"He's actually pretty gentle when he bites him in the sleeve," Grennan says of Hulk's training sessions with his son. "He almost doesn't want to."

Another reason to be upset: Even though Grennan claims his giant "pit bulls" dispel negative connotations about pit bulls, Grennan still puts on a "training suit" and gives the dogs the aggression training sessions that make them such valuable commodities.