Cov dev yug yaj tau raug coj mus rau Tebchaws Europe txog li 4 txhiab xyoo, tseem muaj cov dev nyob rau sab qaum teb Pyrenees uas zoo li zoo li bobtail thiab ciam teb collie. Cov lus piav qhia ntawm cov dev no, uas tau muaj sia nyob rau niaj hnub no, lees paub tias cov poj koob yawm txwv ntawm bobtail yog cov dev uas nyob hauv roob. Tib neeg siv lawv li kev yug tsiaj thiab tua dev. Cov tsiaj zoo li no tsis tau koom nrog hauv kev nthuav qhia, vim tias tau ntau xyoo lawv tau saib xyuas "tsev" dev nrog kev thuam.
in dev