As of 3/28/20. Ferox will tame at the wrong level but once put in cryopod will correct to tamed level. A live 145 changed to 217 once in pod post tame. Also dododex is not accurate on x3 possibly x1. The same 145 took 20 element for full tame. At 5% per element. Please if this was helpful take it to the top.
***Submitted 30 March 2020. Takes a lot more element than Dodoex says. On official Xbox x3 taming a level 125 ferox took around 22 element to tame. Worked out at just under 5% tame bar per feed. Make sure to use a bola once the ferox has enraged to hold it still. If you use it while ferox is small it won’t work.***