The Purity of Cats and Dogs and Washing the Vessel

Question:
Honorable Shaykh, this is Abu 'Abdullah. He sent a set of questions. He says: In our present time, with the comfort and luxury some people have, some people have acquired dogs and cats in their homes. These cats and dogs, Honorable Shaykh, are they pure or impure? And do they affect the wudu' (ablution)?

Answer:
As for cats, it is permissible to keep them, and they are pure. Whatever they drink from or eat from, if they have licked it, the rest is pure thereafter. This is based on the saying of the Messenger (peace and blessings be upon him) As for dogs, they are impure, and it is not permissible to keep them in houses, because the angels do not enter a house in which there is a dog or an image. And whoever keeps a dog, his reward is reduced by one qirāṭ every day, as in the hadith Keeping a dog is permissible for one of three purposes: either for guarding a farm, or for guarding livestock, or for hunting. These are the three matters in which it is permissible to keep a dog.
One of them is with earth. Yes, the hadith is authentic in its narration. And regarding the washing of what a dog has licked, the vessel in which the dog has licked is washed seven times and rubbed with earth in one of them, or in the last one, or in the first one, according to the narrations. The important thing is that the use of earth is required in washing the vessel in which the dog has licked. The wisdom behind this is to combine the two purifiers, water and earth, which indicates that the impurity of the dog is a severe impurity. Yes.

The presenter:
May Allah reward you with good.