Yes for my Morgan gelding. I was catching him one day, and to get to the barn we had to walk through another pen. There was a new horse in that pen, but the horses in the second pen were all occupied eating. I was unlatching the gate with my back to them when my horse spun around and almost wrenched the lead rope from my hand. I turned (to correct him because he wasn’t allowed to pull like that) only to see the new horse running towards us. My Morgan spun around, double barrel kicked him, and put himself between me and the new horse. He would not move, nor would he leave the pen, until I completely left the pen. Only then would he follow me out of the gate.
The same Morgan also almost fought off a loose dog on a trail ride. Somebody’s rottweiler was loose, and came charging out of their garage, and across the front lawn. We were across the street. I yelled to the owner to get her dog, but the Morgan was squaring up to face the dog down. I have no doubt that if the dog had crossed the street, he wouldn’t have been going home. (Thankfully for all, he listened when the owner called him back. And then she was upset with me for asking her to get her dog?
)
My OTTB? Bless him, but his response to danger (real or perceived) was to buck me off and run, so that the murderous jump pole or shrub could eat me first.