The Prophet (ﷺ) forbade the unnecessary purchasing of a dog because it contained impurity and the angel never entered houses containing dogs or statues. The Prophet (ﷺ) guided us on how to purify a utensil if a dog would lick it with saliva, tongue, or mouth. In this hadith, he guided us to wash the utensil seven isolated times, using earth for the first time. This number of washing is either done out of devotion as the Prophet commanded, or because of the dog's impure saliva. In An-Nasa’i’s narration, the Prophet (ﷺ) said, "One of them is with earth,” so he confirmed that using earth was one time without stipulating to make it the first one. On the other hand, he commanded to use earth, for it could kill diseases emanating and transmitting from dogs to utensils, but using only water could not remove them completely. He commanded to repeat using water to make sure of their cleanliness. On the other hand, there is no difference between types of dogs in this regard, whether it is permissible to own it, such as a hunting dog, or not. Finally, this hadith confirms the importance of following the ways to prevent diseases..