I'm currently reading Patricia McConnell's "The Other End of the Leash." The very first line in her introduction (after the story) is: "All dogs are brilliant at perceiving the slightest movement that we make, and they assume that each tiny motion has meaning."
Couldn't be truer! Just yesterday, Casey was on the mainfloor of our house in the living room in her playpen. I was downstairs with my husband, and ran upstairs to grab something from the kitchen ("ran" being the operative word here - I literally ran up the stairs because I was in a hurry to get back downstairs). When I got to the top of the stairs, Casey was sitting on her bed, wide-eyed, head-bowed low, ears slicked back like she was caught with her hand in the cookie-jar. Apparently, I only "clomp" around the house when I'm angry or annoyed, and she took my heavy steps to mean that I'm mad about something. Today, I did a little test to see if this were true, and while in the kitchen, I took intentionally heavy steps out into the living room where she was. The same thing again! It's crazy how aware they are.
Gotta be more cogniziant of my own behaviour!