I just used bug repellent and I tamed the dung beetle easy using spoiled meat and just walked out of the cave with holding the dung beetle then flew away on my Argie back home. I called him horn and he lives in a nice home.
You can’t feed beetles titanosaur poop. So best is diplo or bronto poop. Go in a cave with bug repellent and a raptor (a strong one). You can go to the hunter’s cave because it is the easiest cave and megalosaurus won’t spawn there nor will centipedes spawn a lot in the there. If you are far away, bring Argentavis to carry the raptor and pick up the beetle yourself. If your lvl is too low well I guess you’re gonna need to travel all the way back on raptor-back. Again.