Muhammad made strange and harsh statements about dogs and these edicts affect dogs in a tragic way. His teachings may have come from cultural bias, Pagan concepts, or his own imagination, but wherever they came from they led to the cruel treatment of dogs.
None of the statements regarding dogs are found in the Quran but they abound in the various collections of traditions (hadith). These traditions are a primary foundation of Islamic theology and are the basis of many Islamic laws. They render dogs as “impure” and worse. Per Muhammads orders most dogs were to be killed and all dogs of a specific color (black) had to be killed.
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Don’t you just LOVE the irony.