"Dogs make sense. They understand hierarchy and the need to cooperate. They come when you call them. A cat though—a cat will take your number and get back to you. Maybe. If he’s in a good mood."

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Only Ron's dog was watching William. He considered that it had, for a dog, a very offensive and knowing look. A couple of months ago someaone had tried to hand William the old story about there being a dog in the city that could talk. (...) The dog in front of William didn't look as if it could talk, but it DID look as if it would swear.

— Terry Pratchett