I looked through old research intially downloaded for my own dogs health problems and remembered seeing something about black tongue.
I found two items :
1, Niacin deficiency - check for mouth ulcers or dental/oral infections.
2, Apparently when eating antacids (such as peto bismol or Tums) can do this. Any chance of that? Apparently it is a reaction and is not very harmful and will go away.
Just passing on what i read, I am definitely no expert, and i would have her checked out definitely.
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