Vitamin and mineral supplements are not necessary unless they are recommended by your veterinarian for the management of certain conditions.
Improper nutrition is only one of the many things that cause poor skin and coat.
After your veterinarian rules out disease as a possible cause, a diet high in energy and fatty acids such as a lamb and rice formula will usually improve your Maltese's hair, coat and skin. Feeding your Maltese a dry food will help to reduce tartar build-up. Tartar starts with a soft deposit called plaque. Hard food helps to scrape away the plaque before it turns to tartar. If you feed canned foods, biscuits or hard chew toys will help to reduce plaque.