We used to have a cat called Shelley; she died right in front of me and it was horrible

I actually feel worse for my brother because he was holding her at the time. She was about 14 and she had kidney failure; thinking about it now I don't know why she wasn't put down. I would say she was a nice cat but she came from a farm and was quite vicious at times, however that didn't make her any less of a companion for the family.
The worst thing about having this experience is that now I have a dog I keep thinking about how upset I will be when he dies, rather than how much I enjoy his companionship now. He's only a year and four months though so hopefully he's got a long while with me yet.
Jam it back in, in the dark.