Step 1: combine 200 oil, 350 cementing paste, and 125 keratin in an industrial cooker. Heat for five hours.
Step 2: tame a rex and at least 25 dodos. Level doesn't matter.
Step 3: once cooker is finished, remove resulting tar and use a brush to apply three even layers of tar to the rex. Avoid the face, arms, and feet.
Step 4: throw dodos at the rex, making an effort to evenly space them on the sticky tar.
Step 5: steer clear as rex has a nervous breakdown ripping the dodos off, leaving the feathers behind.
Step 6: seek shelter as nervous breakdown continues as rex develops the ability to scream and send other animals running.
Step 7: after rex has calmed down, give it a hug. This will bolster its confidence and teach it to support your other "special" tames.
Step 8: rename your rex "fluffers" or "danger floof."
Step 9: enjoy your new yutyrannus.