Easiest and safest way to tame this is to lure it under water. They stop aggro and you can tame as you please. Just make sure you come up for air every once in a while. Also be sure the water is deep enough.
Found in almost every caves except the underwater , Lava and Snow (they don't like extreme weather I guess) easiest taming methods lure it into water and let it sink to bottom, no oxygen stat so won't drown, go and feed it spoiled meat, tame it , put a saddle and get out :)