So a man walks into a bar with his dog, and the bartender says " sorry, you can't bring your dog in here, i don't want to clean up after him".
The man says " its ok, the dog is trained" so he lets him in
A second man and his dog walks in, and the bartender says " sorry mate, you can't have a dog in here".
And the second man says "he's trained its ok" so he lets him in
Then a third man walks in with dark glasses and a dog, the bartender says "hey man, i don't know what your doing but you can't bring the dog in with you"
And the man replies " but I'm blind, i can't move around with my seeing eye dog!"
The bartender says " mate, there is no way that chihuahua is a seeing eye dog"
The blind man looks confused and says "hold on, they gave me a chihuahua?!"