This week we said “Adios” to Cinco. Our fluffy eight-pound terrier mutt had become the punch line to a sad joke. He was epileptic, had lost a leg to cancer years ago, and now, at sixteen, he faded to six pounds. He also was afflicted with a creepy skin condition, cataracts, dental disease, a weird open sore on his throat that wouldn't heal, and, for the last several days, whenever he would awaken and try to get up, he would squeal out in agony. (Lost dog: Answers to “Lu