Hi there. So, I'm thinking of possibly signing Missy back up in Agility, and was wondering which size crate would be good to get her? I'm looking at the 'Precision Soft Sided Pet Crate 4000" or "5000"... just wondering which one would fit her better. She's full grown at 3 1/2 years old and is 40 pounds, but I want to make sure she has enough room to stretch out if she wants to. Her official jump height in Agility is 22" so I'm assuming she is 22" standing at the shoulder. She has never been in a crate before but with lots of time, patience and training... which I've got tons of!, I'm sure she would get the idea pretty quickly. I would not only use it for Agility possibly, but if I go visit family or friends with her I would take it with me and use it at those times too! My questions in a nutshell: 1. Should I get her the "Precision Soft Sided Pet Crate 4000" or the "Precision Soft Sided Pet Crate 5000"? 2. What is the trick to figuring out how big the crate should be, besides making sure the dog can stand up, sit, lie down, and turn around in it... I'd like her to be able to stretch out if she wanted to as well. 4000 measures: 36" L x 24" W x 23" H 5000 measures: 42" L x 28" W x 27" H If a crate says "Suitable for: up to 40 pounds -- the 4000 would I bump it up to the bigger size as Missy just hits 40 pounds? 5000 is suitable for: up to 70 pounds... Help? Thanks in advance!! If you don't understand something I've written, just let me know and I will try to explain things a little better!