bad joke for a Monday

Yes, I know it is late and most of you won't see it until Tuesday. Sorry.

A guy with a Doberman pinscher asks his friend who has a Chihuahua if he wants to grab a bite to eat.
The man with the Chihuahua says, "We can't go into a restaurant. We've got dogs with us."
"Just follow my lead," assures the other man.
They walk over to the restaurant and the guy with the Doberman puts on a pair of dark glasses before entering.
When he gets inside, the doorman says, "Sorry sir, no pets allowed."
To which the man replies, "It's OK, this is my seeing eye dog."
"A Doberman?" the confused host asks.
"Yes, they're using them now. They're really quite good."
The host shrugs and says, "Come on in."
Next, the guy with the Chihuahua decides to give it a try, so he puts on his sunglasses and walks in.
The host stops him immediately and says, "Sorry guy, no pets allowed."
"You don't understand. This is my seeing eye dog," the man replies.
The host says, "Oh, come on, a Chihuahua?"
At which point the man yells, "They gave me a Chihuahua?!"