I drew this very rough and somewhat crude size chart of the primary characters of my webcomic several months ago, as I can struggle with keeping scale consistent in drawings, yeahhh. It's mostly for my own reference and is quite crude, but it's cute so I like it anyway.

From left to right: Dhh (it/its), Dog (he/him), Cat (she/her), Rebirth Horse (they/them) and Act (they/them).