Allah's Messenger said: "When a man performs Salat, and there is nothing in front of him like the post of a saddle, or a camel saddle, then his Salat is severed by (passing of) a black dog, a woman, and a donkey." It was said to Abu Dharr: "What is the problem with the black dog rather than the red or white one?" He said: "O my nephew! I asked Allah's Messenger just as you have asked me. He said: 'The black dog is a Shaitan (devil).'"
Reference: Jami` at-Tirmidhi 338 In-book : Book 2, Hadith 190 English translation : Vol. 1, Book 2, Hadith 338
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