"No Pet's Allowed" joke

Two buddies were out one Saturday, walking their dogs. One had a Doberman Pinscher and the other had a Chihuahua. As they sauntered down the street, the guy with the Doberman said, "Let's go over to that restaurant and get something to eat."
The guy with the Chihuahua said, "We can't go in there. We've got dogs with us."
The one with the Doberman said, "Just follow my lead." They walked over to the restaurant and the guy with the Doberman put on a pair of dark glasses and started to walk in.
The bouncer at the door said, "Sorry, Mac, no pets allowed."
The man with the Doberman said, "You don't understand. This is my seeing-eye dog."
The bouncer said, "A Doberman pinscher?"
The man said, "Yes, they're using them now. They're very good."
The bouncer let him in.
His buddy with the Chihuahua put on his pair of dark glasses and started to walk in.
Once again the bouncer said, "Sorry, pal, no pets allowed."
The man with the Chihuahua said, "You don't understand. This is my seeing-eye dog."
The bouncer said, "A Chihuahua?"
The man exclaimed, "A Chihuahua? They gave me a Chihuahua?!"