These thing are basically living spike walls, they impaled my dodo, so I got out my lvl.378 Rex, Fully imprinted, 60k+ health, 4000 melee, 215+speed. And killed it, for now on when I’m on my Rex, I’m going to slaughter every kentro I see, with my Rex I’m finna slaughter it. #Remembering josh the dodo..
It's best to leave them alone unless you want to tame them. They act like spike walls, so you and your dino take damage when you melee it, and it's a lot of damage, even low level ones do a lot. If you want to kill one, it's best to use ranged attacks like a gun or a wyvern blast.