Matruf bin Tarayf al-Harithi مطرف بن طريف · The Book of Water

"It was said: 'O Messenger of Allah, you perform Wudu' from the well into which the bodies of dogs, menstrual rags and garbage are thrown?' He said: 'Water is pure and it is not made impure by anything.'"

"The Messenger of Allah (ﷺ) said: 'If a dog licks the vessel of any one of you, let him throw (the contents) away and wash it seven times.'"

"If a dog licks a vessel then wash it seven times and rub it the eighth time with dust."