It's hard to tell in photos because scale. The bed Link is on in the two photos is a full size. He won't cooperate with measuring him but he is 16 pounds and the cat door microchip sensor has trouble reading his chip (we had to extend the range because from forehead to shoulder blades was too far on regular settings). It doesn't help that Rocket is tiny (the other cat in the first photo). She's 7 pounds and can fit on most hardcover books curled up.