Silver Linings 24 Immune Support Supplement for Dogs is optimum for when your dog’s health is challenged by genetic issues, aging, or any other situation that falls short of perfect youth and health, you might consider adding #24 Immune Support to his baseline of #10 Foundation. The herbs in #24 Immune Support for Dogs are designed to aid and support a robust immune system, making it easier for your dog to fight off issues that might otherwise cause trouble.