To tame a dodo you will need:

4 metal or better behemoth gates

A longneck rifle (preferably ascendant)

300 or so shocking tranq darts

Lots of raw prime meat

Bio toxin/narcotics (torpor drops insanely fast)

Ghillie

Step one: sneak up on the dodo and try to trap it in the gates (you can also bait it into the gates but it will probably kill you before then)

Step two: once trapped knock it out and put prime meat in inventory

Once taming make sure to regularly feed it narcotics. A dodo's taming effectivness actually starts at 5% and you have to feed it corpses (preferably rexes) to increase taming effectivness.

You now own a dodo!