This one involved a little girl (who I usually inhabited as the viewpoint character) who comes to live with a Basque immigrant family in the farming area around one of the cities in the Maritime provinces of Canada. (Those sorts of details come out in thinking about it later, not by thrusting themselves into my awareness at the time). On waking I can see a large part of it comes from the book The Good Master by Kate Seredy.
In any case, if I sit still too long, my eyes close and I'm back there. No horses in my version, though.