Today in Darebin Parklands Penny walked with one of her humans (me!) and suddenly realised we were to meet her other human.
Here are some pictures of her body language as she scanned the grassy area.I was interested to see the tail position when she is on alert in a pleasantly excited way.
A browse of the Internet showed lots of sites discussing tail positions in dogs, and the one I found most useful was at the ASPCA. DVM360.com has an interesting article in general on dog body language, and Australian Canine Current Events has an extensive list of sites relating to canine body language.
However, I haven't found an exact match for this particular position.