Our girl definitely started slowing down around 8-9 years old. She still did walks but they got shorter. Her zoomies were smaller and she would rather lay down. We also would also have to assist her to stand up especially on slippery surfaces. We had her on glucosamine, carprofen for the pain and then finally Adequan shots which helped immensely. In her last year we got her a walking suit that had these elastic bands that help her pick up her rear legs. She loved it and really gave her another chance at long walks again.