So I'm not sure anyone saw my thread on Twiggy's swollen hock, because I phoned the vet straight after, so there was no more to be said. It was diagnosed as a bog spavin, and today she went in for X-rays, which showed a bone chip, that needs surgery.
Just waiting on a quote from the vet, and a date for her to go to the clinic.
But in full on panic mode! Has anyone had this before? Any advice?