A fox with mange started appearing in the yard. I have no way to know if he's the same fox that's appeared on our wildlife camera a few times, but he's probably a denizen of our woods. Over the past few years, I've noticed that some critters like foxes, raccoons, and rabbits end up coming close to the house when they're in distress.
We try to help out the animals that tap out when we can. Most of the time there's very little a lay-person can do, though. Treating foxes with mange is apparently pretty easy though. I found this link:
http://www.foxwoodwildliferescue.org/2017/01/05/treating-sarcoptic-mange-in-red-foxes/
We're trying it out now. It will be interesting to see if it works.