The German sheperd and the husky

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Mercury got lost as a pup, having not even opened her eyes. She was found by a cat who took her in as if she was her own. Mercury, who was raised with and around cats, always thought that she was a cat herself and always aided her adopted sister mittens of need be.

One day a mysterious white dog shows up. Mercury tags along with him since he is dragging Mittens along. How will things play out?