Source: The Great Interpretation of Dreams (Ibn Sirin)
Slaughtering in a dream indicates injustice, disobedience to parents, and cutting family ties. Slaughtering what is lawful to slaughter indicates honoring parents or performing Hajj. Slaughtering a son indicates gaining wealth.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Slaughtering indicates marriage. Whoever sees himself slaughtering an animal will triumph over his enemy.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Slaughtering is interpreted as good if it is for what is lawful. Whoever sees himself slaughtering himself has repented sincerely.