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One of my dogs pupil is enlarged.Is it due to her seizures?She is being treated for them. The Vet suspects brain tumor.

Posted by wriston2

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When only 1 eye shows an enlargement of the pupil, that generally indicates either a problem within that eyeball or along the path of the optic nerve to that eye.  The optic nerves split into 2 paths at the base of the brain and go to each eye.  So, yes, any kind of inflammation or tumor in that area of the brain could cause what you are seeing.

Helpful Buckeye

Thank you so very much for answering my question!
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