Forcefeed one of your creatures with hemogoblin cocktail (unlocked at lvl 60) and let the Cerato attack this creature. (You can ride the creature and navigate it to get attacked more, but this isnt necessary.) It will get drunk and once it is 100% drunk it will become passive and you can feed it (pref. Kibble is Extraordinary).

Depending on your taming speed and food, you might need to make it drunk several times so you should prepare several Hemogoblins (it should take ~1-2 to get it drunk once).

!Traps are not not needed but recommended to not have it get distracted, HOWEVER the trap must be big (a square of 4 behemoth gates is enough), otherwise it wont get drunk.