Is there a tool to help my dog move around without my grandma having to throw her back helping him?

I have a ten year old dog who currently lives with my grandma. My dog recently got injured and now he cannot lift himself up so he relies on my grandma to help him get up. However, my grandma also has back pain and she can't really put the effort into picking him up everytime he needs to pee or needs to walk around. They live in a huge plot of land where my dog can walk around and pee anywhere he desires. We did get him a diaper to pee and poop without having to move but he does like to walk around and it's heartbreaking to hear him cry everytime he wants to get up and walk around but my grandma couldn't help him. I was wondering if there is a tool to help him get up on his own and walk around without hurting himself and without my grandma throwing her back everytime he needs to go on a walk. Thank you in advanced for any suggestion.