Snail bait   Was the death of a pet your first memento mori? Or, if not a pet, some working beast you cherished? Let me swell the dead dog corpus by one story. My family’s dogs were cursed. One by one they perished, run down by a redneck, backed over by mates, put to sleep for nipping. Three heelers died of thirst running circles on the gibber after taking dingo baits. But the only one I saw dead was the first.   I am seven. I find her in the bean patch before school. She chewed off teats to get…