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Demodectic mange is a noncontagious, nonitchy skin disorder caused by mites that results in hair loss and occasional skin infections in dogs.
As repugnant as it sounds, harmless mites live in our dogs' skin (and our skin too for that matter). Female dogs spread the microscopic Demodex canis mites to their nursing pups.

Sarcoptic mange is an extremely irritating, highly contagious skin condition of dogs that occurs when microscopic female mites burrow into a dog's skin to lay their eggs.