what would make a dog chew on its paws until it bleeds?

My sister-in-laws little white dog chews its paws so its white fur is red from the blood and its mouth is covered in blood. She also scratches her neck raw. The vet doesn't seem to know what to do about it either.

    what would make a dog chew on its paws until it bleeds?

    My sister-in-laws little white dog chews its paws so its white fur is red from the blood and its mouth is covered in blood. She also scratches her neck raw. The vet doesn't seem to know what to do about it either....
    General Dog Discussions : what would make a dog chew on its paws until it bleeds?...