All of our dry pet foods contain different strains of probiotics, including some specific to dogs and cats. These probiotics are essential for a healthy immune and a healthy intestinal system. Unlike some brands, our probiotics aren't destroyed by heat when the kibble is cooked. That's because our probiotics are encapsulated and protected. That's how we can guarantee the amount (measured in CFUs, or Colony Forming Units) that are viable even after consumption and digestion.