My girl is 13 years old. She is a border collie/golden retriever mix (guess at best). She had ACL surgery in both her back legs. One was done approx 6 years ago and the other approx. 4 years ago. Anyone have a problem with arthritis settling in years after the surgery? I have started her on glucosamine from the pet store. I want to bring her to the vet but it sounds like they put them on some pretty serious meds? Thanks for any input. She can still jump up on the couch and climb stairs but sure is winded after a short walk.