I just today looked it up and verified that it was a luna moth. It's a big, beautiful thing--the dog thought it was especially appealing because she tried to eat it. They're one of the largest moths in North America. Unfortunately for them, their life as an adult lasts only about one week.
As they say, beauty is often so evanescent.
Oh, yeah, here's the dog that tried to eat the moth. Her name is Dea and she's a rescue Lab:
