Below are a number of Hadith on various aspects involving dogs. All Hadith are from the Sahih collections of Bukhari and Muslim, or the Sunan of Abu Dawud. After the Quran, Bukhari's set of Hadith are regarded to be the second most important books in Islam, followed closely by the Hadith of Muslim. I quote from these sources to prove that these Hadith are not just a few isolated or unsupported cases. I have sorted Muhammad's statements concerning dogs into 5 categories. All of these illustrate different facets of his beliefs regarding dogs.