吠非其主的英文是「Barking is not his master」
fei fei qi zhu
吠:狗叫。狗朝着外人乱叫。旧比喻各为其主。
《战国策·齐策六》:“跖之狗吠尧,非贵跖而贱尧也。狗固吠非其主也。”