Don't buy this product !! I purchased one stroller and it was okay, so when it got old I ordered another one ( about 2 years later ) Apparently they changed it, and the quality went down by 99%. The old version is not available anymore. This product is not safe for animals or the owner . Because they made the velcro attachments so small it comes undone every 5 minutes. The whole bottom stroller kept collapsing as a result, I  constantly had to stop to fix it, it even came apart in the middle of the street crossing and my dog fell out. This is a safety issue, and there is a quality issue of being made of cheap material,j it's just a piece of junk, too bad they had to cut corners and did not keep the original design