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If the dog has more than 4 digit on the back paws, the most medial are referred to as the dewclaws. Some dogs have more than 1 dewclaw, and they can have all three digital bones present.
It sounds like you are more familiar with dewclaws that have nails growing, but do not have all 3 phalangeal bones.
These can be removed as usual, but do not have to be. This is not a concern that should prevent future breedings of this pair. If they produce otherwise good specimens of the breed, they are fine to match again.
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