Q: Hobie, my middle-aged indoor-outdoor cat, awoke this morning with one very abnormal eye. His upper lid droops, and a white film covers the inside corner of the eye. What caused this? Will it ...

Horner’s syndrome is a rare condition that affects the face. Symptoms typically affect only one side of the face, and may include a drooping eyelid, a constricted pupil, and the absence of facial ...