We have an 8 week old pup. I bought a 36" crate and put the partition in. Well, our first night, he pitched a FIT, even though he had room to move around, I had a nice soft blanket on the floor of the crate, and 2 stuffed animals.He just would not settle down. At 3 am, I remembered that his pen at the breeders was much bigger, so I decided to take my chance and take the partition out. I knew that would mean he may pee in the crate, so left the blanket down on the front half, and just had the crate floor on the back half, so if he peed, it would be easy to clean. Well, guess what? He slept on the back half!! I think he was too hot and confined with the partition! No accidents in the crate! So, others may advise to use the partition, but every dog is different. My breeder has 36" crates for her adult females and they can stand in them and turn around. Hope this helps! good luck!!