Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Fleas in a dream are weak, slandering enemies. Their bite indicates gaining wealth from foolish people.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Fleas indicate worry and sadness. Killing them indicates victory over enemies.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Fleas are interpreted as a weak enemy. Whoever sees them leaving his house, worry has left him.