See this piece about a police dog jumping out and chewing on a runner passing by. Then ask yourself, what would happen to YOU, and what would happen to YOUR dog, if yours did the exact same thing to an off duty policeman out for his morning run. Remember, you're not an Only One.
Hat tip to Radley Balko at The Agitator for the link.
On a parallel note, it seems this is not a singular event. It happens from time to time.
See this piece at Otago Daily Times of New Zealand.
"Oh, he's not usually like that. I'll talk to him..."