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Dr. Matt
Dr. Matt, Veterinarian
Category: Dog Veterinary
Satisfied Customers: 5798
Experience:  DVM - 13 years experience in canine medicine and surgery.
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My daughter and her dog went on a ke and it was hot and when

Customer Question

my daughter and her dog went on a long hike and it was hot and when they came back one of her dog pupil was dilated ,
Submitted: 1 year ago.
Category: Dog Veterinary
Expert:  Dr. Matt replied 1 year ago.

Hello - I am Dr. Matt - I would be glad to help you with your question.

Is she vomiting?

Any labored or trouble breathing?

Are both pupils dilated or just one?

Customer: replied 1 year ago.
no vomit, she is resting right now and very tired from the hike, no signs of difficult breathing, it is the left eye that was dilated and not reacting to light
Expert:  Dr. Matt replied 1 year ago.

Did she have any trauma to her head or eat anything out of the ordinary on her hike?

Does she blink the eye with the dilated pupil when you tap the corner of her eye?

Customer: replied 1 year ago.
trauma from the hike may be a possibility, she does blink the affected eye. My concerns if its an early sign of neurological damage, stroke, dehydration??
Expert:  Dr. Matt replied 1 year ago.

Thank you for the additional information.

I am sorry to hear that one of her pupils is much larger then the other. This is a disorder called anisocoria. Since she has never had this problem before this most likely did occur while she was on the hike. The most common causes are trauma to one of the eyes such as a corneal scratch/ulcer, glaucoma (though usually the eye is also blue), a blood pressure disorder causing the retina to be damaged, trauma to the head, brain, or nerves in the head from an injury, inflammation in the eye called uveitis, or a fever illness in the body.

Dehydration does not typically cause one pupil to be dilated, though a stroke or a neurologic disorder unfortunately can. One of the concerns after a long hike when it is hot is heat stroke which could cause a neurologic disorder if her body temperature became much too high though usually other signs such as excessive panting, vomiting, extreme lethargy, and even labored breathing are seen.

When Anisocoria does come on suddenly like this, I honestly would recommend taking her to a vet as this could potentially be serious especially if she is showing any other symptoms I mentioned above. If she does have any disease process in her eye the vet will be able to treat her with the appropriate medication to prevent any further problems for her.