Natura Pet Products adds Chicken Meal & Brown Rice Formula Senior dog food to its California Natural line. Because the new formula includes only one protein, one carbohydrate source and limited healthful fats, plus added vitamins and minerals, it is an excellent option for all senior dogs as well as those with food sensitivities, the company reports. Ingredients include glucosamine, chondroitin sulfate, omega-3 fatty acids and herring oil. The dog food is available in 5-, 15- and 30-lb. bags.