Yeah I imagine a glass guy can, but I like to break, errr... do things myself. I want to be able to decide on the spot to pull them out and put them back in just as fast.

I was googlin' and couldn't find anything quickly. But what I was thinking was removing the small glass, permanently attach a foam seal, something like a door seal weather strip, and then finding a way to mount it to the truck with ease of removal by maybe some wing nuts and a bolt attached to the truck body? It would have to sandwich the window between a couple plates, or washers on 4 corners? Not really sure what direction to go with, but end result would be awesome for the dogs. They should be able to stick their heads out the window "holes" and get some fresh air.