enzoötic

from The Century Dictionary.

• Permanently apt to affect brutes in a particular district: said of diseases. Enzoötic and epizoötic have the same meaning in reference to brutes as endemic and epidemic in reference to man.
• noun The continuous prevalence of a disease among brutes in a particular district.
• noun A disease of brutes locally prevalent.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Afflicting animals; -- used of a disease affecting the animals of a district. It corresponds to an endemic disease among men.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Archaic form of enzootic.