Maybe the problem is that “wild” <-> “captive” is a false dichotomy, and that can be confusing. The options should probably be “wild” or “domestic” and “free” or “captive”. The typical zoo animal would be (wild, captive). A feral cat would be (domestic, free), it would help in this case to have an “introduce species” flag. Pets like cats and dogs would be (domestic, captive). While free/captive seems to be a clear choice most of the time, wild/domestic can be ambiguous.