Shelties need to have their toenails cut regularly. Overgrown nails can interfere with movement and hinder your Sheltie’s movement and walking ability. There are a variety of types of nail trimmers for dogs. Cutting the toenails with a Guillotine-style clipper work quite well for a Sheltie. To use these, place the toenail inside the metal loop, align the upper and lower blades with the area to cut, and squeeze the clipper handles.