[QUOTE=SmartAlex;8157684]
I just thought of another.
My horse spooks at the smell of natural gas. Twice he has diagnosed gas line leaks along the road that even I couldn’t smell. I just flag down a well tender when I can, tell them to get their sniffer out and check such-and-such a spot and bingo! Gas leak.
He can also diagnose those pesky mechanical noises that the car never makes when you take it into the garage as vehicles pass us on the road. “Hey buddy, my horse says your universal joint is about to go… or at least that’s what it sounds like”[/QUOTE]
Have you considered renting his services out? 
Last summer I rode a trail horse who HAD to spook and dance sideways past just this one very specific small tree branch on the ground. Every time. Any other fallen parts of tree? No big deal. Really narrow crossing because part of the land bridge had washed away? Okay. Random dude mucking around in the woods where there weren’t normally people? Meh. Little tree branch? OH MY GOD IT IS GOING TO EAT ME!
I also rode a lesson horse who’d randomly decide deer were terrifying. Not deer right next to him or anything, no, only when they were peacefully grazing up on the hill a reasonable distance from the arena. Suddenly it’d be “DEER!” and you’d have teleported all the way from one short side to the other. Which was impressive agility, when you think about it.