In superficial pyoderma, the infection has penetrated somewhat further. Deep pyoderma happens once the infection spreads to the skin layer closest into the dog’s muscle mass. natural - unthinking; prompted by (or as though by) instinct; "a cat's natural aversion to h2o"; "supplying to aid was as instinctive as respiratory" https://vehicleaccidentrights20628.post-blogs.com/56556681/a-review-of-dog-immune-system-support