Pupillotonia in a Spitz dog: a case report

An 8-year-old female Japanese Spitz dog was reffered to Shiraz University Veterinary Clinic, with sign
of anisocoria. Clinical examinations revealed mydriasis in the right eye. Ocular examination revealed a
dilated and unresponsive right pupil to focal illumination. By testing with topical 2% pilocarpine, the
tentative diagnosis was parasympathetic denervation of the right iris sphincter muscle—pupillotonia