I think the problem stems from people thinking, "fair is almost dysplastic" which is not the case.
I agree with looking at an entire pedigree, the historical hip production of littermates and siblings and generations behind the dog.
I would be more apt to buy a puppy from a parent with "fair" hips, if their lines have a strong consistent record of acceptable hips, than a puppy from "excellent" parents that have numerous dysplastic dogs in the history.
2 dysplastic dogs can produce a pup with "excellent" hips. But I would not want to breed back to that dog
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