MM - whilst not disagreeing with you, I was wondering if you would consider the fact that a dog with a score of 1:9 (for example) may have had an injury relating to the average score, vs the better score of 1 on the other hip? Would you take this into consideration if choosing to use a dog with such a score?
I believe the incidence of injury is very relevant in determining the suitability for breeding etc, but unless you are the owner of the respective Labradors, it is a bit difficult to determine when to trust this as being the case for score variations to exist?
Also, in the example given where there was a 9 on one hip, this should be closely examined, and I would look at each of the criteria being assessed for each hip, and if any of these were above a 3, then I would be very reluctant to use for breeding, unless the incidence of injury could be proven (eg Vet report etc) that could be taken into consideration for the poor score..