Back in the 80's   me and 3 buddies were on a 6 day  horseback Bull  Elk hunt in B.C.  We are not trophy hunters, although after day 3 we had seen numerous trophy Bulls and plenty of cows and quality Bulls.  About 10am in the morning on the 4th day of the hunt,  we were navigating a trail up the side of this rocky outcropping working a herd of Elk from down wind.  I was out in lead on my horse with the others single file behind me.  ALL of a sudden my horse stopped in its tracks, he snorted, reared up a little, struck one of his front  feet on the ground, and started backing up, he would go no further forward.  Something was up,  I initially thought Rattlesnake, Grizzly, Cougar,  did not see anything.    So, we turned around and went back down the trail approx.  2 blocks.   We got off our horses and settled them down.  Me and one of the other guys grabbed our rifles and walked back up the trail to where the horse stopped, and continued up the trail another 1/8 mile.  (cont.)