Two friends run into each other

Two friends run into each other while walking their dogs.
One suggests lunch. The other says, “They won’t let us in a restaurant with pets.”
Undeterred, the first guy and his German shepherd head into the restaurant.
The maître d’ stops them, saying, “Sir, you can’t bring your dog in here.”
“But I’m blind,” the man replies, “and this is my guide dog.”
The maître d’, apologizing profusely, shows both man and dog to a table.
His friend waits five minutes, then tries the same routine.
“You have a Chihuahua for a guide dog?” the skeptical maître d’ says.
“A Chihuahua?” the man says. “Is that what they gave me?”