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Tarry black stools are often a sign of bleeding in the upper digestive tract. Sometimes dogs can have allergic reactions to proteins--and it can cause inflammation and sloughing in the intestinal tract. So I think a visit to a vet would be a good idea, too, just to rule out certain things that could become serious problems in the future if left unaddressed.
I hope you can get the root of the problem soon, Bo and Spectre! Welcome to the board!
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