But apparently, some of them are in comas, etc. Probably he just smells death. Do cats have a sense of smell like dogs? I know it’s not as good, but it’s probably better than human’s.

I expect that when you’re dying and your systems are shutting down (kidneys, etc.) you probably smell different.

Sheba could always tell when I was pregnant, before I knew. Hormonal changes must emit some sort of odor.