I already experienced some trouble encountering/taming one of these animals, but here are some tips:
1.) As soon as you see a Carno, don’t try to outrun one of these. First try to locate the nearest rock you can climb onto. Then attract the Carno and get on the rock, Tranq it, and you should be fine and safe!
2.) If you fly a bird, attracting one of these might be a bit difficult. Try to hit the Carno with your bird, and fly really slow. (But make sure your bird doesn’t get damaged a lot!) Carnos lose their attraction very easily so it can be a but difficult getting the animal where you want it to be!

I hope this helps you taming a Carno!
Good luck on your tame!

I use y trap on the carno and it work up-vote so people will know

I highly recommend getting up high on a boulder or getting the carno stuck somewhere while knocking it out. Unless you are a high level, you will not be able to outrun it.

If you want the Lazy, Easy way of taming one of these, Get it to Agro onto a Diplo then use a Slingshot or Tranq Arrows/Bullets and You got yourself a easy carno tame.

Rookie taming method (worked first time):
1. Craft a larg bear trap (and about 15 tranq arrows)
2. Find a carno out In the open and easy to see/fire at
3.get carno to aggro on you (somehow) and walk into the trap
4. Tranq it quickly before it breaks out
5. Tame!!!