He should've kept it to himself.
That's not your loving choice. If he wants to share it with us, let him. Nothing is stopping him.
There are countless useless rants on here that are not needed at all, but this is actually something that is really sad.
I haven't seen you complain about those.
If you don't want to hear him talk about how his dog died and how he was one of his most precious friends, fine.
But don't go and stuff on the topic endlessly just because you don't care.