So I have a pack of high levels and here’s how I did it. Get a pteranadon, pick up the alpha and carry it into a caged in area. The alpha title will go away when it’s separate from the pack. Leave the area for a while and return in a full ghillie suit. This will give the dog time to calm down. Crouch into the area and move very very slowly. Get behind it and pet. It does not matter if there’s a concrete floor. I tamed a level 200 with the floor and everything. Works best during a taming event but will work any time.
Normally you can't tame the pack leader, so just get a pteranodon or argy, pick it up and drop it in a large area (like a separate section of your base). When you take it away from the rest of the pack, it removes its 'pack leader' title, allowing you to tame the highest level hyena of that pack.