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My dog's eye is dilated after corneal ulcer treatment. Is this normal?

Updated On September 23rd, 2025

Pet's info: Dog | Dachshund miniature | Male | neutered | 12 lbs

My dachshund recently was at the vet for a corneal ulcer. it was a pinprick, not bad at all. it has been 3 days since hes been to the vet an his pain eye drops have been administered daily in the morning and the ointment the vet prescribed is being used regularly. today i noticed that the eye that was the issue is extremely dilated, so much so, that i cannot see the color in his eye. his other eye is fine. is this a problem?

2 Answers

Most Helpful Answer

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Answered By Vanessa Yeager DVM MPH

Veterinarian

Published on December 3rd, 2017

Hi there and thanks for posting. Yes, what Susan is experiencing is called Anisocoria; one pupil is larger than the other. Sometimes this can occur due to an injury to the cornea (she currently has), injury to the nerves of the eyes, or brain injury. It can also be caused by glaucoma of the eye, or severe inflammation of the interior portion of the eye. I would recommend Susan see her veterinarian again vet very soon to check for any other underlying conditions besides the corneal ulcer that may have caused or contributed to the anisocoria. Treatment is then based on the underlying cause. I hope this helps and thanks for using Petco Pet Education Center, formerly Petcoach!

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    Answered By Destini R. Holloway, DVM

    Veterinarian

    Published on

    Typically topical pain medication for the eye (ie Atropine) causes dilation. This is a normal effect of the eye medicine. However it is still important to express any concerns with the vet who prescribed your pets medication, just to make sure there aren’t other factors that we are not aware of. Otherwise there doesn’t appear to be an immediate concern and you should be able to discuss things with your vet first thing Monday morning. Best of luck to you and take care.

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