Two men are walking their dogs and come to a bar. Unfortunately, the sign on the bar says, NO DOGS ALLOWED. So the one man says to the other man,
"It's okay. We'll just pretend they are seeing eye dogs."
So the first man walks into the bar. The bartender says, "Can't you read? No dogs allowed."
The man says, "I'm blind and this is my seeing eye dog."
The bartender asks, "They are using Rotweilers for seeing eye dogs now?"
The first man says yes and goes on into the bar.

The second man walks into the bar.
The bartender goes, "Can't you read? No dogs are allowed."
The second man says, "I'm blind and this is my seeing eye dog."
The bartender asks, incredulous, "They are using chihuahas now??"
The second replies, "WHAT??? They GAVE ME a CHIHUAHA????"