We have had some behaviors in horses I would have called quirky that had I advertised the horse I would have possibly put in an ad --Our top event horse slept flat on his side with his mouth open --was called to the stable more than once at a horse trail with other exhibitors thinking he had passed in the night. He also groaned loudly when sleeping, and I had a few colic calls too. At home we had a few passersby stop to let us know the horse had passed in the pasture by the road. Even now sometimes I go out on the deck over looking the pasture and whistle so he’ll move --he’s 29 now and I’m never sure . …
We had a Morgan gelding --great horse --who wouldn’t haul with a breast bar. Take that off and he’d travel great. Leave it in and he’d put his front legs over it and ride that way. Quirky.
And there was an OTTB who pooped in his feed dish. Every. Single. Day. If you took his feed dish out, he’d poop in his water bucket.
My current #1 horse has to have his head turned away from the rider as he/she mounts --just pick up the outside rein, and he’ll stand all day at the mounting block, ditch, or where you are getting on. Leave the reins slack or turn his head in, and he circles into the rider. I think this is a trained behavior for possibly quick on-the-fly mounting --but I need him to stand still (old lady) --so, pick up the outside rein and he will.
My #2 horse is the most un-affectionate horse – never nickers, whinnies or puts his ears up when he sees me. Gives me that, “sigh, it’s you.,” Eyore face when I get him in the pasture or out of his stall. 20 years of treats and rubs and he still looks like he’d like to spit on me. But, he’s 100% --never let me down ever --rode him 250 miles across MI in two weeks and he never put a foot wrong. I have heard that his entire line (Hancock) are like that --all work and no love – but I’d tell a buyer (if I ever sold him), not to expect an “in your pocket puppy dog” --so yeah, quirky.