What are the best grooming techniques for a matted dog to ensure their coat stays healthy and shiny?

To maintain a healthy and shiny coat for a matted dog, it is best to regularly brush and comb their fur to prevent mats from forming. Use a detangling spray or conditioner to help loosen the mats before gently working them out with a slicker brush or comb. For severe mats, it may be necessary to trim or shave the affected areas. Regular grooming and proper nutrition can also help keep the dog's coat healthy and shiny.