Phil, A dog's nails need to be kept short. Just as with our fingernails, they never stop growing. Most of our dogs don't run on rough ground or concrete enough to keep them short. Our five chessies all get their nails ground on a regular basis. We use a Dremel. They accept that more than clipping. Short nails are necessary not only for our show dogs, but vital for overall foot health. Imagine us guys walking around with 2 inch toenails! Long toenails can cause the toes of the dog to splay out and even tear the skin between the toes (the webbing.) This, in turn, can cause gait problems and then structural problems.
Rich