He bought it! We were at the dinner table and I told son # 1 that while I was dusting I found something in the living room and he should go look...(puhlease, like I dust, but he didn't find that hard to believe---which is most likely why, at eight, he still believes in the tooth fairy. I did get an eye-roll from hubby though). He came, bouncing,skipping, running back into the kitchen and showed us the note and the 2$ (and, by the way, what's the deal with THAT? I got quarters). He read the note, which I wrote with my left hand so he wouldn't recognize the handwriting, and felt so relieved. Hubby even said, "Come to think of it, I did hear Hannah bark" and I said, "We should leave a note for the tooth fairy the next time she comes and tell her that Hannah is a nice dog and won't bite".
Potential future psychiatrist couch moment diverted...whew.
Thanks Hannah, you really helped us out of a jam!