Wayne Cummings’ cowboy boots are a bit gnawed and his denim jeans pant legs shredded but he’s aliveThe 80-year-old Cummings — known for his work with horses and for promoting the now-defunct Manteca Rodeo held for years where Bass Pro Shops is now located — was knocked down and attacked Friday by a Pitbull belonging to a homeless man.The attack happened near the backdoor of the Manteca Moose Lodge on North Main Street at Lancaster Drive.The Pitbull pounced on Cummings’ back, knocking him to the ground. It then bit into his boot and wouldn’t let go. Cummings said the dog’s owner — a homeless man known to sleep in an abandoned auto body shop just north of the Moose Lodge partially blocked from view of North Main by trees — struggled for three minutes or so to get his dog to let go.