It is narrated from the Mother of the Believers Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "Were it not that dogs are one nation among the nations, I would have ordered that they be killed; (so now) kill every pure black one among them."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Layth except Ammar bin Muhammad, and Amir bin Sa'id is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5163
Hadith Gradingمحدثین:فيه ليث بن أبي سليم، وهو مدلس
Hadith Takhrij«قال الهيثمي: فيه ليث بن أبي سليم وهو ثقة ولكنه مدلس «مجمع الزوائد ومنبع الفوائد، ج 4، ص 43»»