Do you think your dog is sensitive to the way their food is made? Bil-Jac Sensitive Solutions could be a good option to try. A healthy immune system is important for sensitive dogs. Bil-Jac Sensitive Solutions features the SmartDefenseâ¢ System, with vitamins C & E â antioxidant nutrients that help support the immune system. Sensitive Solutions also provides guaranteed amounts of vitamin A and linoleic acid to help nourish and replenish the skin and coat.