My dog is neurotic. Leave it to us to get a dog who bites her nails. She appeared to be chewing on her foot, and knowing that she had gotten into some burrs the other day, I was afraid I had missed some between her toes, so I got down on the floor with her to check it out. EEWWWW, wet dog fur to go threw before I can get between those toes, but no burrs. So I began checking out her foot to see if there is a problem. No problems detected, but she was chewing on her toe nails. Off to the cupboard to get the bottle of bitter stuff we bought so she will keep the leash out of her mouth (says it is safe to spray on skin) and I sprayed her foot. That has stopped the chewing for now. Guess I need to take her for a nail trim (I'm always afraid I will hurt her if I try to do it).