My 9 yr old collie has been getting progressively weaker in the hind end but his xrays look good. He has a lot of other medical issues but started to get noticeably weaker in the past month so I took him back to the U today. The vet thought it might be a bulging disc. Romie will go back for an MRI on Thursday and, if advisable, will have back surgery on his lumbar area. The vet, a specialist, thought his prognosis would be good so he will get the surgery if it is recommended but I'm just wondering what kind of experience others have had with back surgery for their dogs.