The original Spanish horses were small never above 15H, but the BLM horses are not usually small some reach up to 16H they cab usually grow taller in captivity with proper nutrition
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The flip side are the more petite 14hh horses that have obvious spanish blood in them. The nice part about the BLM office is that they can look up the horse's tag # and tell you what herd it came from and give you some idea of what the horses in that herd tend to mature into. Always fun!