I have a 50 pound inside dog. She is very sweet and loves her new crate. The only problem is that the latches are plastic and she broke one of them in the first week just by laying up against the door. These are very nice, but could be alot more durable. 

I also have a 6 pound chihuahua who loved this crate so much that I had to buy her one of her own. I have not had any other trouble out of them other than the broken latch.