From wiki islam site above
Killing Dogs[edit]
Maimuna reported that one morning Allah's Messenger (may peace be upon him) was silent with grief. Maimuna said: Allah's Messenger, I find a change in your mood today. Allah's Messenger (may peace be upon him) 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 (may peace be upon him) 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 for the orchards should also be killed, but he spared the dog meant for the protection of extensive fields (or big gardens).
Sahih Muslim 24:5248
Angels do not like Dogs[edit]
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)."
Sahih Bukhari 4:54:448, See Also Sahih Bukhari 4:54:450, Sahih Bukhari 5:59:338, Sahih Bukhari 7:72:833, Sahih Bukhari 7:72:843, Sahih Muslim 24:5246, Sahih Muslim 24:5249, Sahih Muslim 24:5250, Abu Dawud 1:227
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: Angels do not accompany the travellers who have with them a dog and a bell.
Sahih Muslim 24:5277, See Also Sahih Muslim 24:5278
Maimuna reported that one morning Allah's Messenger (may peace be upon him) was silent with grief. Maimuna said: Allah's Messenger, I find a change in your mood today. Allah's Messenger (may peace be upon him) 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 (may peace be upon him) 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 (angels) 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 for the orchards should also be killed, but he spared the dog meant for the protection of extensive fields (or big gardens).
Sahih Muslim 24:5248
All of the above state where they are from. How is it possible to say they are not real?