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Hi, I'm Dr. Steve. From what you are describing, I don't think they cu it too short, usually the nail will be sore for a day if it is cut too short, but it typically doesn't turn white. I would wonder about the nail being torn away from the nail bed underneath. (Like having a fingernail pulled up and away from the finger). This disrupts the blood supply and could make the nail turn white. If this is the case, the nail may have to be removed completely and she may need antibiotics . You should have her examined at your vets ot see if this is what's happening? Good Luck
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