There does not necessarely need to be tests drawn from the suspected individuals;
in this kind of situations when the suspected dogs have had (according to the pedigree information) several litters and plenty of offspring, one way to try to find out if the pedigrees are correct or not is to test and compare the DNA of the offspring from the suspected individuals. -All the offspring of certain individuals should be genetically (atleast) 50% the same. (Grand children 25% ...and so on).
Maybe it would be easier to find helpfull people among the buyers / owners of the puppies?
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