Mini Cooper 3 door Rear Window Open?

On the 3-door hardtop the rear side windows are fixed and do not roll down

On the 3-door convertible the rear side windows can roll down but they do not have independent buttons.
There are 3 window buttons buttons

• drivers door window
• passenger door window
• All side windows

For the all side windows button, watch 9 seconds to 22 secs of the video linked below. It rolls all the windows down. So if you need a rear side window down for your dog then all the windows have to be fully open.
From factory your remote wont roll the windows down like this video but you can see how the "all side windows" button will work using the button on the driver's door.