Suitable for dogs over 10 months old, ROYAL CANIN® Shih Tzu Adult is specially formulated with all the nutritional needs of your adult Shih Tzu in mind.ROYAL CANIN® Shih Tzu Adult contains an exclusive combination of nutrients that help to maintain your dog's skin health – which in turn positively affects the health of its coat. This formula includes the omega-3 fatty acids EPA and DHA, as well as an enrichment of borage oil.