Take your rockcarrots, troodon kibble or mejo berries and sneak up on them and feed them once. Then you can ride on its back. Jump on the equus' back. Then feed immediately it gets hungry. Quite easy tame
Quick tip: I was trying to tame one at my house and it bucked me off and my other tames thought it was hurting me so they killed it. Long story short, put all your other tames on passive if you want to tame it at your house.