A rose by any other name would smell as sweet.
Every horse seems to have at least three names: the “real” one, the barn one, and that special one. What are some of your pony’s names?
Aside from calling all of my horses pony, I don’t really do nicknames. I mostly just call them by their name when referring to them and pony when talking to them (eg: Hi, Pony). All of ours are also using the names they came with. I changed the names of previous horses I’ve owned, but I like all the names of the horses I currently have so they got to keep their names.