What comes to changing area with them pets, this is almost a year old post but I guess it's still valid:

Quote Originally Posted by Camate View Post
We asked the development team about the possibility of changing areas without pets de-spawning. Unfortunately, they mentioned that they do not currently have any plans for this, mainly due to the fact that at a system level it is not possible (wyverns, however, are a special case). Also, since the Beastmaster’s “Call Beast” ability consumes an item on use, it is favorable for game balance to keep it this way.
From the thread: In the Name of all that's [Holy], Let us Zone with Pets!


Who knows, minds do change during years passing by, even when it comes to something such as Dynamis!