Our 10 year old Rotti tore his right rear ACL 1 year ago they decided that it would not be good to do surgery as the cost and recovery time would be to long, even if the operation went well. 1 year later he broke his femur on the same leg after slipping off his ramp. Yesterday we spoke to the vet, he was amazed and astonished that our Rotti got around, later down and even sat on his broken femur. Stay a showed cancer in his knèe and get was amazed the leg didn't break there as the knee was a mess with cancer. We made the decision to have his leg amputated. We will be picking him up today. Vet said when he went to se him first thing in the morning after the operation or Rotti was standing and ready to go. I would say go for it, let him enjoy his adult years pain free.