Recently I kept receiving announcements such as
The Stray Donkey (Tame) has been missing for a week. At first I thought maybe they just strayed off, but I've lost six animals so far, and I think I'd better take some effort to figure out what's going on to prevent further loss.
The pasture is placed at the edge of the map. Usually my dwarves don't go to that area, which somehow contributed to the lack of witnesses. Currently I only have one ten-dwarf squad, should I station them near the pasture to monitor it?
Where have my animals gone? How can I find them back?