Interesting... See coyote or fox pups (or anything really) with mange in the offseason? Try putting out some dog food (or other bait) mixed with this.

Haven't tried it yet. Two comments from the post:

"1 cc of 1% ivermectin would clear that right up if it is mange. Normally an subcutaneous (under skin on the neck) injection or it can be given orally. I have cured bad mange in dogs.
"

"This is the kindest thing you could do and keep the fox around. Put it in some drop baits where you are seeing the fox. Put out enough to treat the pups and female too!"