This is one of six LEGO moulded fully-grown System horses produced: 93083, 4493, 6171, 10352 (this one), Bullseye from Toy Story, and the Scala horse.
It also first turned up in a set six years ago - in 2012.
And - I'm not with my LEGO collection at the moment, so I can't check... but if there's an anti-stud under its left front hoof, it has a total of six stud connection points: One under each hoof, and two for the saddle.
Finally, I think the horse itself might, at the factory, be put together from six different moulds: Left and right side of the head, left and right side of the body, and left and right side of the legs.