A guy walks into a neighborhood bar on a quiet afternoon and notices that the only other customer at the bar is a guy with a rather scary looking Rottweiler lying nearby. The newcomer asks somewhat nervously: " Does your dog bite?"

The man at the bar smiles pleasantly and says: " No, he never bites"

The newcomer sits down - whereupon the Rottweiler proceeds to take a chunk out of his leg.

As the ambulance people are removing the victim he hollers out at the man at the bar: " "I thought you said your dog didn't bite!"

The man shrugs: " He ain't my dog".