This is the way I heard it.
John Kerry walks into a bar and the bartender says, "why the long face?"
A week later the same dog walked into the same bar, this time he was wearing a black hat, a black vest, black chaps, black boots, a black gun belt with a pair of black colt .45's one on either side, and a black bandage around his sore foot. He goes up to the bar and says to the bar tender "I'm looking for the man that shot my paw"