Does your dog bite Joke

A man walks into a shop and sees a very handsome dog. He asks the shop assistant, “Does your dog bite?”
“No, my dog doesn’t bite.”
The man happily tries to pet the dog, but the dog attacks him viciously. A little later he stumbles to the shop clerk, “Hey, you said your dog doesn’t bite!”
The shop clerk shrugs, “He doesn’t. But that wasn’t my dog.”