A dog's paws sweat, and the tight, webbed spaces between the toes trap that moisture along with whatever they pick up on a rainy walk, a swim, or a bath. Those skin folds get little airflow, so warmth and dampness linger right where the skin is thinnest. That warm, moist pocket is exactly where the Malassezia yeast that normally lives quietly on the skin can tip out of balance.
Sodium Caprylate, 115 mg (yielding 100 mg caprylic acid): A medium chain fatty acid that works from the inside to support a balanced yeast population when the skin's surface gets damp and out of balance.