Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The shepherd in a dream is anyone who holds a position of authority. Herding sheep indicates authority over people who obey him. Herding pigs indicates authority over disbelievers.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The shepherd indicates a knowledgeable scholar or a just ruler. Whoever sees himself herding sheep will gain authority.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The shepherd is interpreted as the king or ruler. Whoever sees himself as a shepherd will gain a position.