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The most obvious answer would be because it is a pregnant bitch. If she is not pregnant, she could have recently had a heat cycle or be nearing the period when she is in heat. Her hormones make the nipples protrude and swell more than normal, changing their shape, hardness, and texture slightly.

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2010-02-14 05:05:38
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Q: Why does your dog have swolen nipples?
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