Abdullah bin al-Samit narrates: Sayyiduna Abu Dharr (may Allah be pleased with him) said: "The prayer is broken by a black dog (I think he said) and by a menstruating woman." I asked Abu Dharr (may Allah be pleased with him): What is special about the black dog? He said: I asked the Messenger of Allah (peace and blessings be upon him) about that, and he (peace and blessings be upon him) said: "It is a devil."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1619