It will depend on the severity of the corneal ulcer. It may be
an uncomplicated affair and cost around $100 or it may be a deep or
more aggressive ulcer and cost several hundred dollars to
treat.
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Corneal Ulcer.
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Take them to the vet immediately.
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seek medical treatment immediately---preferably an opthalmologist. If left untreated, your ulcer can result in impaired vision and possibly blindness!!