I think there have been very few of those "off" results.. and I don't think it is fair to count the "off" ones [i.e., like Medjai's parents] when you can't trust that the breeder tested the dogs said to be tested [which obviously isn't true since we know that Medjai is affected].
We have a bitch that "tested" as a Carrier.
We will admit we weren't strip-testing… our mistake.
Her coat recently was going to crap.. so we took her in for a thyroid panel.. which was low..and a urinalysis was done also as Mom thought she had a UTI.
Unfortunately she did not.. she was spilling sugar.
Mistakes happen, so I am not upset about that...
I am actually thankful that the results we got were not "clear" and her have been a carrier [and had been bred to a Carrier – that would have totally sucked].
The boy she was bred to is a Clear, so all pups were Carriers [one IND, which we know isn't a possibility now that we know she is Affected].
If you have a dog that you aren't breeding, I don't see a hurry to get the test done if they are from TWO clear parents. Or even from a CLEAR/IND or CLEAR/CARRIER breeding.
I do plan to get my OFA number for all my clears before they are bred, as I want 'written proof' that I have had the testing done.