Have you ever bitten your dog?
I'm serious. My mother lived with me for a year before moving in with my brother, and I raised her dog from a pup. Under my instruction he was leash broken, well mannered and polite...but she's ruined him. I was over at their place earlier today and he was acting up, bossing humans and just basically being a jerk...so I bit his ear. I looked up and my whole family was looking at me like I'd lost my mind.
Have I? I raised him like a momma dog would have, and mommas nip their pups when they're getting out of line. He knocked off his crap too, but now my family thinks I'm even weirder than before.