
When a dog is x-rayed for hip scoring the plates are sent to the BVA panel for scoring. Each individual hip is given a score between 0 and 53. A 0 score is perfect, and very rare. To get a total score, the number of points awarded on each hip are added together.
So for example:
A dog scoring 3 points on the left hip and 4 points on the right hip will have a total score of 7 points.
Every breed which is hip scored will have an average for it's breed. Ideally a breeder will not use a dog or bitch which is a lot higher than the breed average, and will use on a bitch a dog with a lower score than a bitch which is at the higher end of what the breeders consider acceptable.
Where you get a dog which has one hip scoring much higher than the other, you have to ask yourself which is the real hip? Usually it is a result of an injury.
Although breeders who use the scoring system do try to produce good sound stock, the nature of hip displaysia will mean that there are throw backs from time to time. For example, I bred a bitch, which scored 11-17=28 points total, which for my breed is a disaster! Our average is 9 points. Her sire was scored as 2-2=4 and her dam was scored as 0-0=0. All the rest of the litter that were scored, had scores ranging from 0-1=1 to 2-2=4. The grandparents of this bitch had also been scored and none had got a score higher than 3-2=5! As this high scoring bitch had roughly equal hips it was reasonably safe to assume that this was not totally caused by damage from over exercising or over feeding. Had this bitch scored 5-23 then I would have had to decide whether this was the result of damage, or was it possible that this bitch had a true hip score above the average on one hip and below the average on the other.
Hope that makes some sense.