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.

It takes more arrows than this app tells you

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

dodo is better