went a size smaller and perfect
I have a 26kg GSP dog, whom according to the calculations should have been more comfortable in a large kennel, but he is a snuggler and likes to curl up into a ball. So we went the medium and I am delighted with it. I keep it inside the house and move it as needed and we have a sheepskin which i have tied in at the back. He loves it. Should have bought one ages ago.