Some older dogs really can't be walked as such. I remember when I was about 25 and my parents asked if I could house sit for them for their dog and cat. The dog, a golden retriever, was about 15 years old and I had lived with her for about 9 years before I left home.
The details Mum gave were that she didn't need walking as her hips weren't great and she didn't have the energy, but to make sure she was let out in the (big) garden at least 3 times a day to have a play with me there too.
Of course, I thought I knew best. She had always had long walks when I lived at home so obviously she still did, right? So the first evening I got her lead, she got all excited and bouncy and off we set. We made it to the end of the road (about 100 yards) and she stopped. Just lay there, tongue lolling and looking at me expectantly. 10 mins later I gave up and carried her home again, much to her enthusiasm. Not easy to carry a retriever.
So of course Mum was right (they are, sometimes....) She wasn't able to go on walks and being let out to play in the garden was all she could manage.
She was regularly left from the age of about 12 when Mum had to go back to work. She apparently spent the days sitting on the settee as she wasn't allowed to do this when they were home!
Despite that she was the happiest, most playful and loving dog a person could want. Daft as a brush too.