I did this in the Coastal Forest region, there are a lot of deer and wolves in either halves of the regions. This was the first trophy I got in the game so it's pretty easy as deer and wolves are pretty big targets. If you don't have it by Shipwreck Cove there are many boar here to hunt, as well. If you use the bow I'd recommend going for the head, or in the body of the deer with a full power bow shot. For wolves and boar you should get them in the head, though wolves are generally more evasive, so be careful.