Maudie gets very excited and shivers, whips her tail, clicks, barks, and grunts. This video is a mild example of this. Of course when I get the camera out, she tones it down.
Shane worries that bird watching upsets her too much, but I think it gives her something exciting to do during the day. And before anyone comments, yes, we finally removed the flannel sheets. They were getting rather furry.