If you don’t issue a command, the beast takes the Dodge action.
I'm sure I'm not the only one disappointed in the Beast Master changes, I think many of us were expecting something stronger than this:

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.
(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.