I toatally agree with brainless, it has been said by Malcolm willis that when one hip is double or more than the other it is an environmental rather than genetic occurance.
I had my GSD hip scored not very long ago, was worried sick about it because when she was a youngster she was hit right across her back end by a washing prop, which is basically a 2x2 wood pole about 9 foot long and very heavy, she squealed and screamed for ages, we took her straight to the vet who xrayed her, he sid there was no damage as far as he could tell but she would be very sore for a while, he put her on anti inflamatories. He did however warn us that this could affect her score greatly, even to the point of ruining it.
We took her to be scored anyway, and I was delighted and amazed at her score of 4:8
If she hadn't been hit by the prop who knows how good her score could have been, but it has satisfied me that this is fine to breed from, the dog I intend putting her with is a low scoring dog.
And no I am not breeding just for hips! my bitch is one of the sweetest natured shepherds I have ever owned, she is beautiful, intelligent and altogether a superb specimin, I look forward to seeing her children

MM said earler that a score of 11:0 is worse than 5:6.
There are 2 ways of looking at this, if a stud dog had a score of 11:0 it would suggest to me that before the hip which scored 11 was damaged, the dog may have had a score of say 0:0 or 0:1 or even 0:3, I would consider this a really good score. The dog has not inherited the scor of 11 on one hip, that score has been caused to happen by environmental factors which with an enlightened owner would not be passed onto pups.
Owning that dogs until old age however would put the thing in a different light, because of the stress and trauma to hip obviously this will affect him as he gets older, and in this situation a score of 5:6 is alot more desirable.
The point I am trying to make is that when we look at dogs scores dogs with one hip double or more to the other, we should be looking at the lower scoring hip as a guide what the upper scoring hip would have been before environmntal damage.
In aswer to the original question, I would want alot more than just Mum and Dad scored, and I certainly would not buy a pup from a bitch which has not been scored, their reason smacks excuse to me, dogs can also be sedated as well as put under a GA, I too think it is fear of the score putting her off getting the bitch done.:rolleyes: