If you have a group of 3 or more tamed then the highest level will become an alpha which will give it a new attack and bleed effect.

Build a stone taming pen of 5 by 5 and stone doorways 2 high with a ramp. Managed to tame 3 allos at the same time with nothing but a pteranodon, tranq darts and a longneck rifle.

When single taming be at least level 52. Tame a Tapijara. Find a group of allosaurus. Next break one off from the pack by attacking one and leading it away. The others might follow that’s okay. Lead them to a cliff and fly over the cliff. Switch seats and begin to tranq the one you want. When you knock it out lead the others away. Go back to the unconscious Dino and begin to place meat in. Have at least ten Narco per level. The other allosaurus will almost always come back. I suggest taming two at a time. Knock out a second one. Then kill the rest as they might attack your brand new allos....... keep in mind that prime meat speeds it up by 70 percent than raw meat so go and kill some Dino’s. Good luck and happy taming! Also they might kill your new tapijara so make sure you have at least 50 percent health when going close. They killed mine.... but I had three more. Always have a backup flyers.

if u are going for an allosaures tame the easiest thing you can do is lead one into a taming pen and then kill the others outside that way they do not have the alpha pack boost affect and you can easily and safely knock it out