A man comes into a tavern and puts his legless dog down on the bar. The bartender comes up to ask him for his order and says: "By the way, what's your dog's name?"
"He doesn't have a name", says the man.
The bartender fixes a second round and in the process can't resist asking: "C'mon, what's the dog's name?" "I told you he doesn't have one."
Over the third round the bartender leans conspiratorially over the bar and says: "I just can't believe you. Everyone gives his dog a name."
"What's the use," says the man, "he can't come when you call him anyway."