The Collaborative International Dictionary of English v.0.48:

Cynanthropy \Cy*nan"thro*py\ (s?-n?n"thr?-p?), n. [Gr. ????? of
   a dog-man; ????, ???, dog + ????? man: cf. F. cynanthropie.]
   (Med.)
   A kind of madness in which men fancy themselves changed into
   dogs, and imitate the voice and habits of that animal.
   [1913 Webster]