[theBCnut]

Food intolerances often cause yeast overgrowth with contributes to the itchy skin etc. Nail biting is often accompanied by reddish brown stains at the nail bed, which is a sign of yeast infection. They can go hand in hand, but they don’t have to. I’ve had 3 dogs with food issues and none of them chewed their nails. I had one that chewed her nails and didn’t have food issues, but she had grass issues and those cause damp feet, which also encourages yeast growth.