It's a passive tame just creep up on one that's alone and it'll give you to pet it and once per enough it's yours if you want to ensure the tame get ghile armor

On Scorched earth you can place a tent on them, follow behind it with the tent ready to set it down, the tent will be red but let it walk to an out edge and spam the place button. Once it's inside open the door it will pop it's head out as it walks around so just crouch to the side of the opening and pet it when it does. As long as your not to close to the opening it can't detect you.

Sooo... ThEsE tHiNgS... I attempted to tame one by knocking it out to calm it because I heard a lit of other people did that too. wElL tHaT dIdNt Go WeLl... It took me over 3 times to trap it in a 2 by 1. Then I knocked it out... AnD tHe DaRn ThInG gLiTcHeD. It showed it was knocked out but didnt have any torpor. So here I am standing in a small box with my pter and a nearly dead glitchy Dog. Huh.

In order to tame one in a pen you must have a another one of a higher level in separate pen nearby. The pens must be close enough that they'll receive a pack bonus, but too close and the alpha will prevent you from taming the beta.

Never tranq it to calm it. It will continue to sleep for the rest of its life. Mine is sleeping since 56min, and i can't wake up with stimulants cause it's glitched and i can't acces to it's inventory. Happy 150 Hyaenodon tame failled.

You have to pet it.......but THEY WILL ATTACK IF THEY SEE YOU!
The thing about these is that they don't attack anything unless an animal has really low HP and isn't surround by predators. Stick around a ton of Ankys or something like Ankys, and you should be fine. They are found in Scorched Earth, even though tons of people say they are not there. I found four in an Oasis.

These things will go full naruto on your butt

If you're on PvE like myself, you're going to need to first bola the alpha and then gate it in with 4 wooden Dino gateways and their coinciding doors. Just make a square around them. Then, wait for the other hyena's to be a far enough distance from the alpha/cage and then cage them in as well. I did each hyena individually because they spook otherwise.

A word worthy of note, Hyaenodon's WILL attack in large packs. Stick to a group of three, including the alpha.
Also worthy to note that alpha's occasionally enter some sort of rage mode and can quickly break free from bola's.

After you've got your hyena's caged, fly out of render distance to lose aggro and then fly back in and proceed with the tame.
You still need your ghillie suit and to be crouched.

These are only one time uses so make sure to demolish for resources after you're done!
Good luck out there!

Alphas can be tamed if taken away from pack I just did it

Don't Shift + Tab for steam overlay, the sprint key makes you stand up. Also don't change from crouches to prone, any stance change will scare him/her

When you locate one of these use the Equus to trap it under its belly and your free to tame without it being spooked

A buddy can hold it with a ptera while you tame it by sneaking up and petting his butt. There you go difficulty avoided.

I've noticed that with enough space in a pen and ghille you can tame one in captivity easily. Don't need a second one nearby. Just run out of render distance and come back to a calm hyena if you spook it.

if taming the alpha be very careful. the alpha is very skittish and will run if gotten close to. to tame the alpha you must kill all pack mates.

Snatch one from a pack with a ptera,if it agros just render out and back in after 3min. Then go full ghillie and start petting

Place one stone foundation and place stone doorways on all four corners, place stone hatch and put four stone walls on second layer, get argie pick up hyandon and drop in top, fly away to de-agro and then crouch up and sit under it, tame through hatchframe

Build a 1x1 out of thatch or whatever your heart desires, grab an argy and drop one in it. You can pet it through the wall! BOOM! Done. I used wood foundation and thatch walls that were lying around. Must be walls, so it can't "see" you. Mine had its head sticking through a wall and I got super close and just started petting it like George from of mice and men.

Crouch when approching these in the wild then you will be able to pet it everytime so long as the alpha is not to near to them.

Is phlinger the only one that knows how to tame a hyaenodon or needs gaming?

You pet the doggo, not feed him