I'm the last person to know since I just got my first GSD and we don't have kennel but I do remember there being a section in the Leesberg video about kennels. It did have a section in it that showed how the dog can go inside since the kennels in the video have cold winters. He showed how the "flap" that covers the entrance into the inside part of the kennel was made out of tires or something?? Because it was impossible for the dogs to chew up quickly and it helped keep the cold air out. If you look up Leesberg in Google I bet there's a section on the website about it.
Good luck!
Good luck!