Moving dock between vertically arranged displays in OS X Mavericks and later I have two displays, stacked vertically. The bottom display is my Mac's built in display, and the top display is an external monitor.

Here is the screenshot of my multiple display arrangement in Settings > Displays > Arrangement:



"Displays have separate spaces" is checked in Settings > Mission Control.

I would like to transfer the dock to the top monitor. The usual way of moving the dock --moving the pointer to the edge of the display, as detailed in the Apple support documentation does not work.

Is this possible when the displays are arranged in this way?
I have had success with my vertical arrangement by hovering the mouse in the orange areas to bring the dock to the top screen. On the bottom screen you can hover anywhere on the bottom of the monitor. 



In your case, where your monitors are almost the same size, it might be a bit tricky to find a spot on the bottom of the top monitor where the cursor wont slip through to the bottom screen and prevent the trigger.