Islam teaches its followers to be merciful to all creatures, and all form of animal cruelty is forbidden. Why then, do many Muslims seems to have such a problem with dogs?
Unclean
Most Muslim scholars agree that the saliva of a dog is ritually impure, and that contact with a dog’s saliva requires one to wash seven times. This ruling comes from the hadith:
The Prophet, peace be upon him, said: “If a dog licks the vessel of any one of you, let him throw away whatever was in it and wash it seven times.” (Reported by Muslim)

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