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Is it normal for dog Horner's Syndrome symptoms to persist for weeks?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | neutered | 3 years and 3 months old | 61 lbs

My black lab has been diagnosed with Horner’s Syndrome with symptoms first appearing almost 10 weeks ago. First the vet thought it was a bug but bc his inner eyelid seemed to be more pronounced but it didn’t go away after a couple of days. On reexamination, unequal pupil size was noted and delay with nerves to eye lid. I’m wondering how normal it is for him to still have symptoms

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1 Answer

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Answered By Dr Stafford, BVetMed, MRCVS

Veterinarian

Published on October 16th, 2017

Poor Ramsay, he is gorgeous though! I'm assuming from your post that his Horner's disease has been diagnosed as idiopathic, is it is for no known cause. In the case if idiopathic Horner's it can be a slow recovery, I would expect it to take weeks. If there is no improvement I would make sure that there couldn't be an underlying pathologival reason such as ear disease etc.

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