This is a joke in that classic joke tradition, the guys walking into a bar.
It's an oldie, but a goodie...Two guys are walking down the street with their dogs. One guy has a German Shepherd, the other guy has a Chihuahua. Suddenly it starts to rain, and the guy with the German Shepherd says, "Hey, let's go into this bar!" The other guy says, "We can't go in there with the dogs!" And the first guy says, "Sure we can! We just pretend we're blind! Watch!" And he goes into the bar and the bartender says, "You can't bring that dog in here!" The man says, "He's my guide dog!" The bartender lets him come in. The other guy waits in the rain, then figures he'll try it. He walks in and the bartender says, "Hey, you can't bring that dog in here!" And the man says, "He's my guide dog!" To which the bartender says, "You got a Chihuahua as a guide dog?" The man frowns and says, "They gave me a Chihuahua?" Enjoy!