In the incident I saw it was the owner who did it. This was about 40 years ago, before anyone knew what a pitbull is. A friend of mine owned one, and a few of us were at a park. My friend knew his dog, and used a thick belt for a leash wrapped around his wrist. He had to use the restroom so he gave the leash to another friend and told him to wrap it around his wrist and HOLD IT TIGHT, because if he sees another dog he’ll try to go after it. Well the doofus he gave the leash to starts talking to someone, not paying attention, when a girl with a young German Shepard walks by. Of course the dog rips leash from his hand and locks onto the Shepard’s leg. The owner comes running from the restroom, grabs a 16 oz beer from somebody’s hand, grabs his dog’s ear and pours it down. Once the dog let go he picked it up, carried it to his car, threw it in and drove away. It was really a horrible scene, but it opened my eyes to what a pit can do.