It both dogs are outside, they just "creep" in front of the window. They peer in with their nose really close, looking to be let in. I say "They are ready to come in because they are being creepy!"
If Leroy is the only one outside, he will bang on the window. If I don't let him in right away, he'll keep banging on the window until I open the door. I always try to not open it immediately cause I don't want him thinking he has me trained! But at the same time, I don't want him breaking the window.