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!
I see what other people have said but in my opinion these things aren't much of a problem especially if you have something like an argentavis as you cna pick them up and either kill them or put them in a trap if you have a trap built but don't have an argentavis my tip for you is to get a fast dino or if you are fast hit one and sprint towards your trap if your lucky you can get the whole pack in there and kill the ones you don't want hopefully this helps but I wouldn't try tame one super early game :)