What's the proper way to brush a double-coated dog to maintain its coat health?

For double-coated dogs, use an undercoat rake or deshedding tool to remove loose undercoat hair without damaging the topcoat. Brush in the direction of hair growth, starting from the skin outward. Regular brushing prevents matting and promotes healthy skin and coat. Avoid shaving double-coated breeds, as it can disrupt their natural insulation.