A man goes into a bar and while waiting to order a drink he 
finds himself standing next to a rather unkempt old man with a 
dog laying at his feet.

"Does your dog bite"? he asked

"Nope, he doesn't" replied the old man.

The man leans down to pat the dog, whereupon the dog growls, 
leaps up and sinks his teeth into the mans hand!

"I thought you said your dog didn't bite" he exclaimed

"That's not my dog" the old man replied!