Despite not being a horse girl, I do still look at https://themanequest.com/, a site for people looking for high-quality horse games instead of shovelware, and they have a bit for this game!

On the project’s website, Tobiano promises to focus on the training process and dressage movements, with plans for other disciplines later on. “Horses also have temperaments and fitness levels which will impact their ride ability,” says the site. “Horses can get stressed by high demands like new exercises or strenuous work.”

Tobiano’s developer is actively sharing their progress in the TMQ communities on Reddit, Facebook and Discord, and Beta testing is currently ongoing.

https://www.themanequest.com/blog/2025/8/17/game-announcement-roundup-here-are-10-upcoming-horse-games-to-keep-an-eye-on-in-2025-and-2026?rq=tobiano

I am not into horse training, but this like a relatively high quality management/sim game.