Old English Sheepdog Skin Infections: What a Heavy Double Coat Actually Traps

The areas most prone to trapped moisture in this breed are the hair around the eyes and muzzle, which stays damp from normal drinking, eating, and drooling, the area behind and under the ears, where airflow is limited by the surrounding coat, and anywhere matting has occurred, since a mat holds water against the skin far longer than a well-brushed section of coat does. Unlike a true facial fold, which stays damp because skin sits directly against skin, this breed's version of the problem comes from hair itself acting like a sponge, soaking up water from a bath, rain, or drool and releasing it slowly against the skin over the following hours rather than drying quickly the way a bare or short-coated area would.

Skin that stays damp for extended periods loses some of its natural protective barrier function, and the warm, moist environment created underneath a wet mat or damp facial hair becomes genuinely favorable for the bacteria and yeast that are normally present on skin in small, harmless numbers to overgrow. This typically shows up as redness, an unpleasant odor, greasy or flaky skin, or visible scabbing once the coat is parted to look. A hot spot, an area of intensely irritated, oozing skin that develops rapidly, often within a day, is a related but usually separate mechanism, typically starting from a dog licking or scratching an already irritated or itchy spot rather than simple moisture alone, though the two can certainly compound each other in a heavily coated dog.