續一切經音義 9.204

9.204

犛牛（上莫交反說文云西南夷長旄牛也案諸經律竝作犛牛字謂如犛牛愛尾也今律文作貓乃捕鼠獸名非此用也）。

Yak (犛牛: the upper character has the fanqie 莫交; the Shuowen jiezi says it is the long-haired ox of the Southwestern Yi; we find that across sūtras and vinayas it is consistently written as the character 犛牛, as in "cherishing its tail like a yak"; the present Vinaya text writes 猫 [cat], which is the name of a beast that catches mice, and not what is intended here).