"I bought this to walk/run with my 40 pound mixed breed (she has the body size of a small Australian shepard)dog to use as she recovers from hip surgery (and is not allowed to walk much until healed). Although this held her weight and was easy to push and maneuver with her in it, it is just too small for her. She cannot lay down completely and if she sits up normally, her head hits the top. The top of the stroller has one zipper that goes all the way across, so it is either completely open or completely closed. It would be much better if there were two zippers that meet in the middle and latch together with a hook or something, so she could have her head exposed, thus making the stroller better for bigger dogs. This product seems very sturdy and well made. The zippers are sturdy. But, it is too small for my pet and I am going to return it."