@StarrySoro
i should probably preface this by saying that i don't want not-deer lore to be Rigid and Unchangeable. so you can use this info, change part of it to fit what you want to do, or not use it at all. go ahead n have fun w/ it
these deers have a massively large size range to being as tall as a human and as small as an ant. but the average deer is like ~2.5 feet tall at the shoulder. so like irl deer but a bit shorter!
they have basic sentience and intelligence. they can strategize and plan ahead, have basic consciousness and self-awareness, feel emotion and love (loosely), but they have no sapience. no culture, insight, subjectivity, opinions, stuff like that!
i think if a not-deer came into contact with a not-cat they would very easily become friends though