if it has only just started, christmas could be pushing it but I would wait then. Arnie is on 3 legs almost always and it's taken 10 months to get like that. If Molly is only doing it sporadically now, keep an eye on it and when it becomes limping about half the time, go see the vet again. I don't know why your vet would suggest surgery straight away. In this case, I would get another opinion and wait. Try another week of anti-inflams and the supplements suggested earlier in this thread. Contact the chihuahua club of QLD for a vet recommendation. As chi's are known for this problem, any vet they recommend should be experienced with the problem and procedures and courses of treatment.