Colorado Wild Boar???
There may be wild hogs in Colorado, but I aint' heard of nobody that has ever seen one. My hunting buddies and myself have some farmer/rancher friends in the SE part of the state (S of La Junta) and we knock back their varmint population once in a while (consisting mainly of prairie rats and song-dogs) but they've never mentioned any wild swine critters.
Even if there are some hogs, they don't show up on the list of game animals on the Small Game license. So if you bagged one on public land you might be in a bit of trouble if stopped by CDOW. As for a game ranch that has hogs, I've not heard of any places that have them, but there may be some - I just have'nt heard of them.
On the other hand, a Small Game license allows you to hunt the "Common Snipe"!
Good Luck, JohnDog