The ID of the foal is 96 and the "tame horse" (which doesn't dump you) is 86:
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//Make adult
if (gotstate("self","tame")) {
play "build_finish.wav"
local $x,$z;
$x=getx("self");
$z=getz("self");
create "unit",86,$x,$z;
freevar $tmp,$x,$z;
free "self";
}
script=end
Any suggestions? It's probably something very simple

EDIT: Works if you put it under on:use, but it'd be nice for it to happen automatically.