If you are on a caribou hunt, it is just by chance. What I did discover on my last caribou hunt was that when that herds were passing through the area we were in, we would hear the wolves at night. When the caribou were not in the area, we didn't hear the wolves. We only saw two wolves in 8 days of hunting. That being said, I just ordered my tags off of the ADF&G website and included a $30 wolf tag with them.