Another guy walks in the bar with a Chihuahua. The first guys sees him, stops him and says "You can't bring that dog in here unless you tell him it's a seeing-eye dog." The second man graciously thanks the first man and continues to the bar. He asks for a drink. The bartender says "Hey, you can't bring that dog in here!"
The second man replies "This is my seeing-eye dog." The bartender says, "No, I don't think so. They do not have Chiwauas as seeing-eye dogs." The man pauses for a half-second and replies "What?!?! They gave me a Chihuahua?!?"