You can use power tools like a Dremel or an angle grinder with a metal sharpener attached, or you can hone it by hand with a whetstone. A unibit is a pyramid-shaped bit that has different diameters.

The grinding bits worked perfectly in our tests, and the polishing bits will eventually make your dog’s nails shiny if you care to put in the time and effort. The Dremel PawControl worked the ...