…is honestly a big pain in the butt, and a task I won’t be repeating if I can help it. But if you really must know, here’s how I did it.
Unlike Breyer and Peter Stone horses, which are made of hard plastic and hollow, Schleich horses (and similar brands) are made of a softer, more rubbery plastic, and they are solid. This makes is much harder to cut through them, because there is way more material to go through.
If you have a Jigsaw you should just skip all this and head to the tool box. But I only have a dremel, so that’s what I used.
The first thing I tried was using an abrasive metal brush tool to strip away plastic where I wanted the model to split. The brush is not very big, however, so although it works well against the rubbery plastic I could only make about a quarter inch dent into the horse.
I needed to somehow get rid of and/or weaken the plastic still firmly holding the middle of the horse together. So I got out a cutting bit…
and starting drilling holes through the remaining plastic (a straight up drill bit would work for this as well).
After drilling a bunch of holes all the way through the remaining plastic, it was weakened enough to pull apart.
You can see the “star” where I drilled through the middle:
The second model, for whatever reason, needed quite a few more holes drilled, but finally he too was able to be pulled apart.