Guide Dog

A blind man is standing at the corner with his seeing eye dog waiting
to cross the street,
when his pooch lifts his leg and pisses down the side of his nice
herringbone tweed
trousers. The guy immediately reaches into his jacket pocket and
retrieves a doggie biscuit
which he starts to offer to Fido.
A businessman, who is also waiting to cross the street, observes this
happening and
interrupts, "Excuse me buddy, but are you aware of the fact that your
dog just pissed all
down the leg of your pants?"
"Yes, I'm trying to break him of this dreadful habit", replies the
blind man.
"Well, it's none of my business," says the onlooker, "but you're not
going to teach him
much by rewarding him with a biscuit!"
To which the blind fellow chuckles, "Oh I'm not rewarding him. I'm
just trying to find his
head so I can kick his ass!"