This video shows some of the details of how to use a Dremel to grind a dog's nails. This is an alternative to the traditional clipping of the nails and is the best way to trim dark colored nails, if not all colors.
Note: I hold our dogs in a "submission hold" but I do NOT recommend this for all dogs. This is a very vulnerable position for any animal and a dog may lash out to protect itself if it does not understand what is going on, is scared, or simply doesn't trust the handler or others around. Do NOT just try this on any dog. There are other positions to put the dog in, this is just how we choose and have trained our dogs to do this.