Guys that is my size 11 Lowa Tibet. I've seen thousands of piles of coyote $hit, and that isn't coyote. Here in WI that would definitely be wolf, but I am not sure if there is much of a wolf population in Colorado. My thought was wolf, lion hadn't crossed my mind, and I have no idea what it looks like so maybe? If that was coyote, there would have been blood in it to crap something that big.