Two winters ago, Ogden, now 42, saw his first red fox, living in a den under a pile of old leaves and suffering from advanced mange, and it stopped him in his tracks. “There was no fur on it.

Hair loss attributed to the squirrel mange mite, Notoedres douglasi, has been reported in both fox and gray squirrels. Notoedric mange is different from sarcoptic mange. The latter, caused by the mite ...