The dogs found this little skull. I think it is a possum as it has the canine and the four molars on the lower jaw. Not sure what else it could be. The size is about right. Possums (or Didelphis virginiana for all you Latin speakers) are interesting creatures.
I once walked into a muffler shop and heard a man say, “I’ve eaten groundhog, but I’ve never tasted possum.” That statement doesn’t seem so out of place in the rural Ozarks, but might be surprising to hear in some places. Do people talk about such things in muffler shops in Boston? I don’t know for sure.