I have an older mixed breed dog who weighs 15 lbs and has started developing arthritis. I also have a little puppy who LOVES to go on his walks through the neighborhood. Not wanting to leave my older dog behind since she has trouble walking far, I got this goofy-looking thing and figured I would give it a try. It really is a life saver. Now my puppy can get his exercise and we don't have to go home early because of the older dog. The older dog LOVES being able to stay out longer without being in pain. I put a blanket in the seat so she can get comfortable and open the top so she can see everything. The wheels are nice and big, they go over bumps and cracks in pavement seamlessly. There's also plenty of storage for toys/water/etc so we can pack it up and go to the park.