Look it is hard to knock them out because of the fact that if you get close to them they will run. So you are going have to hit a 360 bola trick shot with the bola and hit it then knock it out. One more thing whe you are shooting it with tranqs they have low health so wait 5 seconds to let the narc kick in. Have fun and good luck survivors!
ARRRRRRRGH I just had THE WORST taming experience! Pro tip: DON'T try taming a high level one by dangling from an argy by a grappling hook... You'll end up dying TWICE and losing your argy, guns, and 80 narcotics... >:( :(