One pupil larger than the other?!
Question: One pupil larger than the other?
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That is not a reassuring sign. Unequal pupils are most commonly the result of increased intracranial pressure, strokes, etc. Unless you're on some uncommon drug or your lighting was stronger on one side of you than the other, you will want to bump your "slightly worried" up to "fairly worried" and seek a professional medical review.
You could be fine, for the record. It could be something relatively benign. However, given the severity of the various possibilities, I wouldn't delay in seeking treatment.
my dog has this his left pupil is bigger he has a tumor in him brain which is causing pressure to the left eye. you may want to check with a doctor.