When taming use a bola. Super effected and makes poor kappy immobile. However avoid being in front of it bc it can still pounce you if you're close. I learned the hard way as my soon to be kapro decided to take me on a tour in the swamp.
My tribe lives right outside the swamp biome and these damned things are a Menace. They've killed my members dozens of times and they surrounded our mounts and killed them. Do not take them lightly they are cold blooded killers and are efficient at it.