Well first of all, is the bitch sable or black? If she produced sable pups and black pups with a black and tan stud, the bitch MUST be sable with black recessive. And yes in order to produce Black puppies the Black and Tan stud must also be black recessive.
How does the Stud Owner know that the Stud does not carry black? Is he's been genetically tested and does not carry the gene for black then there must be another dog in the mix.
If the only other dog of concern is an all black male, the only puppies it could have sired would be the black or the sable puppies. Those would need to be tested for sure. Although (And I could be wrong) I think that when parentage of a litter is contested the whole litter needs to be tested for registration.
Bianka vom Eisernen Loewen IPO3, CGC, TC 1-3-08
Cade vom Eisernen Loewen IPO1, CGC 3-25-09
D'Artagnan (Tag) vom Eisernen Loewen BH 2-2-10
G Aiko von Burkndeiros SchH 3, IPO3, FH, TC, KKL2 9-17-02 (Retired)
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