Doesn't need to be dismissed. It doesn't need an "auto kill point" like mounts. If it could be clicked through like any other pet in every other MMO I'd be utterly satisfied and would climb onto the rooftops to sing the praises of who ever did it here.
Have pets hide like the personal banker and vendor and the problem would be solved. They get out of the way, sometimes even after you click and start interacting with them.
The problem can and should be solved without auto-despawning.