I do not state the specific actions (unless obvious, like attack). When a monster dodges, I describe them as watching carefully and waiting for something (dodging). This can be easily misinterpreted as a Readied Action, which is the intent. They might be Readied or they might be Dodging, and the players have to decided for themselves what it might be. Of course, I seldom have monsters Dodge or Ready anyway, unless there is a tactical reason for it.
As a DM, if a monster is using the dodge action, do you tell the PCs? Also, when a PC is dodging, do your monsters know this information? Thoughts?