I bought this because it not only is a stroller, but also attaches to a bike which we have not used yet. My dog will play ball all day but refuses to walk the neighborhood, he stops dead in his tracks.. border collie. He's 45 lbs and as long as you strap them in and have them stand or lay to where their weight is disbursed evenly it's good. But if he is all the way yo the back, it wants to top backwards so I just have to make him readjust. But all in all, he likes going for a ride. A great product so far. Easy to assemble, I haven't tried folding it, I just leave it in my garage ready to go