A very tolerant man or...?

A blind man was waiting to cross the road when his guide dog peed on his leg. He reached into his pocket, took out a biscuit and gave it to the dog. A passerby who'd seen everything was very touched. "That's very tolerant of you after what he just did."
"Not really," came the reply. "I'm just finding out where his mouth is, so I can kick him in the nuts."