This man is walking down the street when he sees a blind man with a seeing eye dog at the corner. All of a sudden the dog lifts his leg and takes a whiz on the blind man's leg.

The blind man reaches in his pocket and gives the dog a dog biscuit.

The guy walking can't believe this so he goes up to the blind man and says "Do you know what that dog did to you?"

And the blind man says "Yes".

And the man says "Then why did you give him a dog biscuit."

And the blind man says"I wanted to find out where his head was so I could kick his ass."