I just received the mobile pet crate and am extremely pleased with this item!  I was able to put together quickly and my 2 dogs are checking it out as I write this!  I have a 5 lb & a 7 lb Biewer Terrier - and each fit in the Small size with room to spare.  I had been keeping them in a "pen" and I think it's nice they have their own space.  I just ordered a 2nd one for dog #2.  The size & style is very good and looks much nicer than other pet crates I've seen.  Order & Delivery was fast and easy - Thank you so much!