My two 8 month old kittens(Gryff and Cully) went to the vet today. The vet told me Gryff the orange tabby is over weight. He weighs 11 lbs and his sister is only 7 lbs. They are from the same litter. I was just wondering if anyone could tell what maybe he looks like he might be mixed with. He was the largest of the litter and Cully was the runt. I just thought he was going to be a large but healthy weight cat. Any thoughts would be appreciated