I saw the blind woman and her dog again. This time I was sans dogs and thus more able to focus my anthropological eye on their actions.
After observing the dog sniff, tug, and basically not lead the woman anywhere, my conclusion confirms a hypothesis Sara had shared with me earlier: it is not an eye-seeing guide dog, but rather a blind woman with a dog.
As to Zephyr, she sustained some nicks and scratches during the squirrel incident. She really is not a tough dog. However, she now thinks she is a tough dog. The evidence? Dogs that want to mark their presence somewhere often scratch the ground with their hind legs after urinating or defecating. Zeus does it all the time, but Zephyr has never done it. Until yesterday.
I guess that squirrel was a right of passage of some sort.
One last thing. Heliosphan mentioned that she wondered what her dog was dreaming about. I am waiting for Steve Jobs and his pals at Apple to come up with iDog dream visualizer. Now that would be one gadget I would certainly buy.