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 recommend, if u don’t have a spyglass, to get enough arrows for a 150. Just in case the Carno you have your eye on happens to be that. I tamed a lvl 60 but outrunning it with my raptor and shooting it with arrows. Its not easy, but it gets the job done without having to build traps and stuff like that. You can just bear trap it and knock it that way.