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This sounds like a mild yeast infection. I recommend taking a toothbrush and warm, soapy water, and scrubbing the black stuff off the nail and nail base. Then, I would buy some shampoo from a pet store that has antifungal and antibacterial properties, and wash that toe in the shampoo and warm water once a day for the next two weeks.
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That looks like a lot more crusting than what I would consider normal. I would try picking and rubbing the crust off, and then try some Epson salt soaks once a day, and if there is no improvement in a week, see your veterinarian.
I would do the Epsom salt instead of the stuff I mentioned above.
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