When taming these guys it's not about the size of the animal you feed it. Its about the experience points it gets from killing it. So things like paracers ain't gonna do much cause they don't give much xp. But using wyverns, gigas, spinos, and rexs, will do the trick. But that sounds crazy to use wyverns and gigas but not if you use a baby. The official ark wiki says a 150 will need about 2000 xp to tame.
At lvl 72 with flak armor on, a lvl 5 Troodon knocked me out with one attack at night. Last thing I saw was those glowing eyes before passing out. My Guess is that they attack vital organs. Luckily my Doedicarus was up for a game of baseball and launched that little devil out into the stands.
Went to go grab a drop during the night on my dragon. I was wearing full Master Craft Flak Gear and two bites from these little sneaky bitches and I passed out. Luckily my dragon was on nuetral. Unluckily that it's fire breath roasted me too. Lesson learned:
Burn everything on fire before you get off your mount...