
Hi Lisa.
The best score is 0:0
the worst is 53:53
Ideally it is generally accepted that a combined score of BELOW 20 is ok to breed from, but the lower the better. The variation in digits is the grading for each part of the hip, the often do vary from one hip to the other.
As well as hips don't forget you want to see CURRENT CLEAR eye certificates too and OCD scoring if possible.
Dawn.