Your Doggy really already has probiotics living in his intestine, but sometimes a dog might not be producing enough probiotics In a natural way to keep him nutritious — and that’s exactly where probiotic supplements are available in. Most probiotic experiments happen to be restricted to their effects on humans. https://www.amazon.com/Healthy-Treatz-Probiotic-Chews-Dogs/dp/B07VCGNM6X