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  We had a kitten once that had one pupil dilated and was walking like a drunken sailor.  I called the vet and they said bring it in right away.  When we got there, he said the kitty had a head injury (I have no idea how, but I suspect it fell off something it wasn't supposed to be up on) and was blind in that eye!  That really took me off guard.  The kitty did regain vision once the brain swelling went down.
 But my advice is get it to the vet asap.  It could be a serious injury.
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