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  • Dogs bite their bottoms to alleviate pain and discomfort. In some cases, dogs may feel compelled to lick and nip their bottoms if something is bothering them down there. Sometimes pain caused by an orthopedic problem such as hip dysplasia or back pain may trigger a bout of chewing.
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Impacted anal glands.

Finally, another common reason why a dog may be biting at the base of her tail until it's bleeding is an impacted anal gland.

One obvious sign that a dog is having an anal gland issue is scooting, when he sits up and drags his butt across the ground.

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