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Hi Dr. W here. If she is walking with only a slight limp but still able to jump up on your lap normally, she may have just experienced a muscle sprain/strain. This should resolve in a day or two. If she worsens over the next 2 days or isn't improving, you may want to consider x-rays and a physical examination to check her joints. Be sure that you do not give her any over-the counter anti-inflammatories because they are not safe for cats.
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