Mange isn’t something animal control would trap and treat, for wild life. You can call an animal rescue group and see if they’ll do it. But, usually, during winter most animals with mange will end up dying. If the animal was healthy to begin with and had a good immune system, it would be able to fight it off. It’s the sickly, injured, too old or too young, the ones that can’t fight it off, that get more sick and end up dying.