Bit of a long shot without much to go on.
I remember reading a book back when I was in primary school, around 35 years ago or so. The main character was a cat, I think a street cat? I vaguely remember there was a bittersweet ending, possibly the cat died and I think the front cover had an illustration of a grey cat on it at night.
I remember really liking the book at the time but for the life of me can't recall anything more.
This sound familiar to anyone?