Unfortunately, when it came time to purchase a couple more crates, I chose this crate. I liked the idea of the top door for use with small pups. These are the worst crates I have ever purchased. The pan is extremely thin, and both had pieces already broken off when I pulled the crates out of the box. The sides do not come together well, leaving big gaps. I plan to buy zip ties to try to help this problem, but then it is no longer portable. The wire gauge is so thin, I don't think this will contain a 4 week old pup, much less a 4 month old or a 4 year old