I saw a nasty dog get sprayed by a mailman, many years ago. The dog ran up and down the street rubbing it's face on the ground, and in the dirt, trying to get the stuff off.

A cab driver once told me a story about a dog incident he witnessed years ago. A person was walking an Irish Wolfhound, that was a trained show-dog, in the park on a leash. An unleashed pit bull saw it and came charging across the grass to attack. When it got close enough, the pit bull tried to go for the Wolfhound's throat, but the dog reared his head up and grabbed the pit by the scruff of it's neck with his teeth, then picked it up and shook it violently until it's neck was snapped. When the pit bull was dead the Wolfhound dropped it to the ground and went back to his walk like nothing happened.