#10 Foundation is recommended for all dogs to support normal health and vitality. #10 Foundation is the base upon which all Silver Lining canine formulas are built. In other words, always use #10 Foundation, and if your dog needs help with specific issues, add the other formulas as required. Choose either power to sprinkle over food, or caspsule style. The exception to this rule is #20 Keep Cool which will be most effective when used alone.