That a 13 inch, 10 lbs sheltie can take up HALF of the bed at night. And I let her! I woke up at five this morning, and little Clara was stretched between DH and I, I was barely on the edge of the bed, with part of my leg hanging over the Queen sized mattress. Clara had pulled the blanket off me to have something to put her head on. And she hurumphed me when I made her move so I could cover back up!