Hard to tell, I think. When Lily was younger, she used to be somewhat skinny, you could even feel her breastbone and her spine. Now she has gained a little more weight.

When I read about Eliot, I thought that hyerthyreoidism might be an option. As you probably know, it's not a rare thing in cats. But let's wait for what your vet says, maybe Eliot is just fine the way he is!

Best wishes to him,
Kirsten