Thank you so much for your detailed response! I feel like your rotti "wait and see" interpretation totally hits the nail on the head. Your description of "if they recognized them as friends, after a moment of stillness, they would shortly right after go into greeting mode with their rear ends wiggling happily" is exactly what happens when a human or dog looks in her direction in a friendly way (breaks her stillness and is eager to say hello)! I'm going to follow your advice and play the "look at me" game at the window and keep these stimuli positive. Thanks again and thank you for creating such a wonderful resource for dog parents!