Both my labs are on lean beef & rice diet. Neither have allergies and their nails are kept trimmed. They both seem to chew in the nails and their pads but don't damage the pads. Their pads are very dry and I spray daily with a protector spray. They sure don't like me touching their feet either. I take them to a groomer for nail trim as there is no way they will let me do it. The female, Shyanne, will once in awhile but not Bear.