"No Pets Allowed" joke

Two guys, one with a Doberman and the other with a Chihuahua, were taking a walk. As they strolled down the street, the guy with the Doberman said to his friend, "Let's go over to that bar and have something to drink."
The guy with the Chihuahua replied, "We can't go in there. We have our dogs with us."
The one with the Doberman said, "Just follow my lead." They walked over to the bar and the guy with the Doberman put on a pair of dark glasses and started to walk into the bar.
"Sorry, buddy, no pets allowed," the bouncer at the door said.
The man with the Doberman said, "You don't understand. This is my seeing-eye dog."
"A Doberman?" the bouncer asked skeptically.
"Yes, they're using them now," the man replied. "They're actually quite good."
"Ok then, come on in," said the bouncer.
The guy with the Chihuahua decided he'd try it too, so he put on a pair of dark glasses and started to walk into the bar, realizing his story would be a bit more unbelievable.
Once again, the bouncer said, "Sorry, fella, no pets allowed."
The man with the Chihuahua said, "You don't understand. This is my seeing-eye dog."
"A Chihuahua?" the bouncer said with a chuckle.
The man with the Chihuahua said, "A Chihuahua?!? A Chihuahua?!? They gave me a darn Chihuahua?!?!"