In a safe spot build a 3x3 trap, 2/3 high using doorframes on all sides. Build 3 wooden signs.

Make a full set of ghillie and a few cactus broths (amount of broth depends on server settings)

Drop it into the trap, equip gear and eat broth before getting close.

Crouch and follow the Hyaenodon. Let it walk into a corner, place a sign directly behind it, one on the side and rotate it 90° and do the the same on the other side (it is possible to leave access to him from 2 doors but due to the thickness on the sides of the door I wouldnt recommend). It should now be unable to step, only rotating in place and you should be able to see him clearly through one door.

You should now be able to stay still (crouching) and pet every 30 seconds no problem.

I highly recommend going to Aberation and taming a breeding pair of high level light pets and uploading, putting offspring levels into charge regen and a few in charge range. Now on any map you can fly around with the light on and they easily identify max levels. I do this with a Wyvern and 280 glowtail, and carry them to a box trap at my base. With your new max levels learn to super breed 😁