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I was reading a pamphlet from the vet clinic today and ironically enough it had the answer to that question. ALL POLAR BEARS HAVE BEEN FOUND TO BE LEFT HANDED. Although I suppose there is a possibility that scientists could have made a mistake.
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I agree with Kazza1994. Although there is probably a very logical reason for her to come home in that state. You might just be jumping to conclusions. Just let her know you are there for her.