I've had many pets in the past. Mostly cats, the first cat I had was injured by a car, so we had to put it to sleep(if you know what I mean). Although, it didn't have to be put down, we could have paid that little bit extra to amputate it's tail, and still be able to live, but then it would be falling over every 5 seconds, as cats use their tail to balance, it would be wishing that it was dead instead.
My next cat we bought I had for over 3 years, it was a Ginger cat, same as my previous one. When we moved houses it adapted to the area nicely for a few months, then it hadn't come home for a week or two, and I haven't seen it since. My last cat, we found, it was about 12am in the night when I heard a little cat meowing, I went outside to find a cat baby cat, smaller than a fully grown man's hand. It was barley 2 weeks old, we kept it overnight, then took it to the vet the next morning and it's tail bone was broken, it also had no microchip, so we were told we could keep it. I named it Antenna, because it's broken tail bone would stick up like a T.V. Ariel/Antenna. This cat also went missing after a year, when my cousin brought his Dog around to our house, it must have frightened our cat, and ran away.
Last and... yea, least, was my two Mexican walking Fish, these are very boring things, they'll sit in the same position, not moving for over a hour. I can't remember much about them, as I was very young when my parents bought them, I only liked them because they looked funny.