Great write up, so glad it is here, a lot of the stuff on the site is not the necessary kind, but the nice to have around if you need it kind of stuff.
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Normally for non-fiction stuff it would be nice to have some references, but I am just going to cite this as a primary source.
This is a top of the line submission, but I believe the reason most people don't RP their horses is because the game is about the player characters - not their horses. It's the same logic as why many DMs just assume a spellcaster has all the components they need in their pouch, no one wants to keep track of those details. Gaming is about fun and adventure, not record keeping and minutae and unless you have a serious love of horses the very large equipment list needed is nothing but minutae. I was hoping the article could provide some more insight into how to incorporate those details without it being distracting or droll.