He may not look overweight in these photos, but he is. I took him to the vet, and he said pretty much what I was thinking, that Boo is a small cat length and height-wise but he is a bit tubby. I've read about all the health problems cats can have later on, and I really want Boo to be healthy for the rest of his life. Cats in NZ are almost all outdoor cats, and are much thinner than the cats I knew in the US. So, maybe he just looks chubbier to me by comparison. The vet also said that with a young cat, it's really not good to have them be overweight at all, as it makes it harder for them to lose weight in the future.