Let me tell you about Tuffy’s Critter. Our dog has a pet possum. It lives under our breezeway deck where we’ve hosted generations of this possum’s lineage. Possums don’t bother me. They eat bugs, don’t get or spread rabies---apparently due to a very low body temperature. They’re marsupials, as you probably learned in elementary school, and they’re fascinating creatures, what with the pouches and…