My dog has mange? Any quick solutions?

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my dog has mange and I don't know for sure but I think my cat has it too. It's not the red mange. It's the other 'sceroptic' or something. I was taking him to one vet and she was treating him for flea allergies, and he was geting worse and worse. And he had the most foul smell. The other vet new what it was when he walked in the little room. He said 'I smell mange.' It's awful. I'm treating him, but it's gonna take a few weeks. Does it spread easy or what?