Pet carrier is well built but I don't see how a 15 pound dog would fit. My 8 pound Chihuahua is fairly comfortable but he could not be much bigger. My husband went on line to the manufacturer's web site to get assembling instructions. There are some strange things to be put together. We put his blanket in it and put his bed away so he would get used to the size and smell before he travels in it. He will go in by himself when he can't find a lap!