I'll never understand why people say "bad dog" in the one situation where "son of a bitch" is completely appropriate.
See, the larger problem is that most dog owners are inconsistent with their training -- sometimes they use the threat of punishment to get the dog to do what they want, sometimes they reward him, and sometimes they ignore the behavior because they don't feel like dealing with it at the time. The problem is that it leads to a dog with no freaking idea what to expect from his owner. At any given minute, you could be Treat Guy, Nothing Guy, or Asshole Who Chokes Him With a Leash.
You want to be Treat Guy. Science backs me up on this -- reward training helps dogs learn, and punishment makes them more likely to misbehave.
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And pizza training helps dogs render whole rooms unfit for human habitation.
It makes sense. Imagine you met an alien, one way smarter than you. Not some bumpy-headed Star Trek alien either -- a 30-foot slug with arms and 63 pairs of eyes. Since you're a reasonably smart creature yourself, you'd be able to recognize a few of its gestures and expressions. But any sort of fruitful communication would be an uphill battle. You'd need to devote every ounce of your attention, empathy, and resourcefulness to cobbling together some mutual understanding. Now, imagine trying to do that while someone chokes the shit out of you with metal spikes.