Historical Ditches and walls will help until Bonemass.. then cover your pets.. maybe not as elaborate as this Star fort around Haldor :-) https://steamuserimages-a.akamaihd.net/ugc/1821165190714151766/8C604F6E4D819A1A668C12DB97C99DB099D51278/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false