The only dino that'll agro an unconscious paracer is a Rex. So if those are taken care off and your cautious about not bringing in extra friend with you. You don't have to worry about other creature damaging your tame.
I had a primitive bow and 47 tranq arrows in a swamp, and I had found a herd of there buggers. I picked a level 10 and ran around shooting it. I chased it around the swamp for a while(it was REALLY hard to dodge the kaprosuchus) and FINALLY knocked it out. After that, I shoved some mejoberrys down its throat and waited... Waited... WAITED for like half an hour until... BAM TAME.
These are great pets, animals don't want anything to do with you, with a long neck, everything comes after you. So my brother and dad went to the red wood forest with one of these and they were trying to tame a thylocoleo and NOT ONE even tried to attack them, they had to spawn cheat one instead, also these animals have amazing health