Dog

Dogs understand your moods and your thoughts, and if you are thinking unpleasant things about your dog, he will pick it up and be downhearted.

~ Barbara Woodhouse

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I think that when you are choosing a dog, you should choose one with a very expressive face. That way, when you are being an ass, your dog will be able to let you know that. If you've ever gotten that hurt feeling look from a dog before, you know what I mean. It can reform you -- at least in the short term. And at least in terms of your interactions with your dog.

Or maybe only people who are asses need a dog with an expressive face.

Regardless, I suggest that everyone choose a dog with a face. A dog without a face would be really scary.