Pretty good beginner dino, tamed a level 1 one just now-took 1 traq arrow from a cross bow to knock, 5 regular raw meat to tame, and I didn't even get hurt in the process. As well as doing a sufficient amount of damage to protect you, it has an ability to knock creatures back with its horns.
Take a second to look at that wonderful Face OF your huge animal that you just tamed your gradong home..... you noticed your animal IS pasv OH FLIP RUNN if you dont have a saddle for your new tamed animal and a Caro runs for you on low level your done for ;)
Having a pack of Dilos is a good way to combat one early on: they can slow it down with their spit attack, they can be generally hard for it to consistently hit, and carnos focus more on dinos than humans so if you get ambushed chances are it might change focus to your dilos. It can be possible to kill a carno with just 2 dilos if they can take a hit and you provide cover fire with any ranged option.
Just tamed a my first lvl 6 (I know, pretty lame...) but I did learn that these guys seem to have quite a large agro range. Just stay calm, you'll be fine with ranged weapons. It only took 3 or 4 traqs to down mine.
Large bear traps are the most under used thing in the game. Get like 7 or 8 of the large variety and when you see a carno put one down between you and it, agro it, shoot transfer and rinse and repeat till he's down.