Tons of cats, mostly since we take in strays that wander up to our house but we're all allergic to cats so they have to live outside. Some stay in the garage, some in the conservatory, but they're all free to wander around. We live on top of a huge hill and the whole thing is their territory.
This leads to a shorter but happier life for them. On the one hand, they can explore and hunt and play and socialize as much as they want, rather than being trapped in a house all day. On the other, there are coyotes, snakes, cars, and crazy people with guns.
Out of twelve cats total, we have two left now. It hurts just as much every time.
The most recent death was actually our very first cat, who had a some kind of condition that gave her a terrible sense of smell. As a result she always stayed close to the house, because for a cat, that's pretty close to being blind. She was about 17 years old and we found her dead of unknown causes. (Most of the time they just vanish, particularly after we've heard a great deal of coyote activity nearby.)
We recently had a scare with my favorite cat, when I found her lying outside drooling and barely able to move. She seemed to have heat stroke, and she was refusing to drink. We took her to the vet and they rehydrated her, and she recovered over the next few days. I was heartbroken over the thought of losing her, though. She's the best cat that has ever lived.
We have also lost two dogs (one to a vaccine that somehow ate up all her red blood cells, and the other killed himself during a panic when he heard fireworks one New Year's), a rabbit, five hamsters, and a number of fish and frogs. We've set all our snakes free (they're local snakes), so they probably died at some point but we wouldn't know.