From Bukhari Vol. 4, #540
Narrated 'Abdullah bin 'Umar: Allah's Apostle ordered that the dogs should be killed.
From Muslim #5248
Maimuna reported that one morning Allah’s Messenger was silent with grief. Maimuna said: Allah’s Messenger, I find a change in your mood today. Allah’s Messenger said: Gabriel had promised me that he would meet me tonight, but he did not meet me. By Allah, he never broke his promises, and Allah’s Messenger spent the day in this sad mood. Then it occurred to him that there had been a puppy under their cot. He commanded and it was turned out. He then took some water in his hand and sprinkled it at that place. When it was evening Gabriel met him and he said to him: You promised me that you would meet me the previous night. He said: Yes, but we do not enter a house in which there is a dog or a picture. Then on that very morning he commanded the killing of the dogs until he announced that the dog kept fur the orchards should also be killed, but he spared the dog meant fur the protection of extensive fields or big gardens.
From Bukhari Vol. 1, #490
Narrated 'Aisha: "The things which annul the prayers were mentioned befure me. They said, "Prayer is annulled by a dog, a donkey and a woman (if they pass in front of the praying people)." I said, "You have made us (i.e. women) dogs. I saw the Prophet praying while I used to lie in my bed between him and the Qibla. Whenever I was in need of something, I would slip away, fur I disliked to face him.""
From Bukhari Vol. 4, #448
Narrated Abu Talha: "I heard Allah's Apostle saying; "Angels (of Mercy) do not enter a house wherein there is a dog or a picture of a living creature (a human being or an animal).""
From The Reliance of the Traveller
On purification, page 98
e14.7 Something that becomes impure by contact (def: below) with something from dogs or swine does not become pure except by being washed seven times, one of which (recommended not to be the last) must be with purifying earth (def: e12.1 (b)) mixed with purifying water, and it must read all of the affected area. One may not substitute something else like soap or glasswort in place of earth.
(n: The contact referred to is restricted, in the Shafi’i school, to contamination by traces of moisture from dogs or swing, whether saliva, urine, anything moist from them, or any of their dry parts that have become moist…)
On trade, page 382
k2.2 It is invalid to transact something that is impure in itself (najasa, def: e141) such as a dog or something affected with filth that cannot be purified (O: by washing), like milk or shortening, though if it can be, like a garment, then it may be transacted.
