The news on Barty is that his cruciate and hock ligaments are fine, he has simply (!) put his disc out again. Vet thinks there is a possibility that he may have damaged the hock ligament at the same time which is why it was slightly swollen, but two weeks total rest has sorted that.

So it is good news that there is nothing else damaged, not so good news that his back has gone out again. Hey ho life goes on