An easy way to keep a carno at a good enough range to hit it safely with tranquilizers is to build a wall three wide and three tall on fence foundations with two doorways stacked on top of eachother with no doors to shoot through. Then, aggro the carno and lead it to the wall. Then run through the door way to get it stuck and proceed to KO it.
A simple way to get these guys is to simply distract them with something delicious. Command something tanky (Ex. Carbonemys) to attack them, then set them to passive so they don’t kill the Carno. Then, you can pelt it with a slingshot or bow and tranq arrow until it goes down. They don’t have the biggest torpor stat, so raising it to max won’t take many tranq arrows (5 if it is extremely low level)