im pretty sure that maine coons are prone to obesity...mine isnt overweight, but im not sure if shes purebred...shes probably about 15 pounds...but i know three maine coons and one im not sure the weight of, maybe 20 pounds...the other is 23 pounds and the other is 32 pounds!!! im serious! its my friends aunts cat, and i met it when i was little and to a little kid, that cat is huge!!! this compares to my poor sara who weighs in at a whopping 7 pounds!! lol