Of course the photographer just about always prefers to "get it right in the camera", but when you are trying to shoot 3 untrained canines, I am so glad there is the option of compositing them. This is one image where I shot each dog separately on the window sill, pretty much in the spot they are in the final image, and combined them in Photoshop. I learned a lot with this shoot back on the fall...and only hope I will remember when/if I attempt something similar again.
I used one of my Alien Bee 800 lights with the octabox. The light reflected in the window but we moved it as far left as we could to get the reflection out of the frame.