The Collaborative International Dictionary of English v.0.48:

Mange \Mange\, n. [See Mangy.] (Vet.)
   The scab or itch in cattle, dogs, and other beasts.
   [1913 Webster]

   Mange insect (Zool.), any one of several species of small
      parasitic mites, which burrow in the skin of cattle.
      horses, dogs, and other animals, causing the mange. The
      mange insect of the horse (Psoroptes equi or
      Dermatodectes equi), and that of cattle (Symbiotes
      bovis or Dermatophagys bovis) are the most important
      species. See Acarina.
      [1913 Webster]