Open Benches is a map of thousands of “memorial benches – added by people like you”. Just type in a search request and see if anyone has dedicated a bench to someone or something, like people and their dogs. For example, this bench was dedicate to Veronica Calver.
You can find examples all over the world, including my town, Toronto. Thanks to the folks who put together this wonderful crowd sourced project.
P.S. If you want to first get a commemorative bench or tree in Toronto, you can get more information on that, here.