We recommend that you do not add vitamins, minerals, or any other supplements, except upon the advice of a veterinarian. When switching your dog's diet, the change should be made gradually by replacing the current food with increasing portions. The change should be completed after 5 to 7 days. The maintenance of proper body weight is most important for your dog's health. Consult your veterinarian for specific weight recommendations for your dog. Remember, fresh clean water should be available at all times