ANSWERS: 5
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It's sexual.
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Because every dog is human. :p
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For the sasme reason we do, it feels good!
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They enjoy it :D
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In addition to the physical pleasure, I think there's another aspect to it. In wolf/dog hierarchy battles, an animal showing its belly is displaying submission. Sometimes, the more dominant animal attacks anyway. So, for a dog to turn up its belly and be treated to nothing but gentile stroking is a very reassuring. It tells the dog that the 'pack leader' (the human) can be trusted completely.
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