What is the ruling on using a brush made from pig hair and killing wild animals for their skins?

The questioner : We have a question. He asks you, may Allah guide you. Yes, please proceed. The question is about a brush made from pig hair. Al-Albani. A clothing brush. A questioner asks me: Is it permissible to use and utilize it, or is it not permissible?

The Shaykh : The answer to this question branches out based on knowing two things. First, is this pig hair tanned or not tanned? If it is tanned, we move to the second thing, which is that the scholars of the Muslims differed regarding his saying (peace and blessings be upon him): So when it is tanned, he (peace and blessings be upon him) said it has become pure.
The scholars differed on this hadith. Is it a general, absolute statement that includes every skin? Whether its original source is an animal whose meat is eaten or one whose meat is not eaten? There are many opinions. Some of them restricted the hadith to what is originally an animal whose meat is eaten, meaning it is eaten when slaughtered. If this animal whose meat is eaten dies naturally, it is not eaten by the nature of the Shari'ah if it died without being slaughtered. Why? Because it became carrion and became ritually impure. So this skin, if it is tanned, has become pure.
This is one opinion. The second opinion they attributed to wild beasts, meaning they included the beasts in the generality of the hadith, and they also said: The skin of beasts, if tanned, becomes pure. Then they differed on the beasts: does it include every beast, such as the dog, for example, and the pig second? There are two opinions among them: some said the dog and the pig are not included in the generality of the beasts, and some said they are included. Then these people divided into two groups: some permitted the tanned skin of the dog but not the pig, and some—and they are the most successful and on the straightest path in taking the generality of the hadith—said there is no difference between all these distinctions, because they are theoretical distinctions based on opinion, and there is no text that excludes anything from these exclusions mentioned previously. Some said non-beasts because they are not animals whose meat is eaten. Some said it is not permissible except for the dog.
And some said it is permissible for the dog, not the beast, not the pig. And some said all these exclusions are included in the generality of the hadith because there is no evidence for any of them. And if that is the case, the answer is: It is permissible to use the brush and wear the sandals whose original source is pig skin, if, as is assumed, these hairs and these skins and shoes are originally from tanned pig hair or pig skin. Is that clear? Very clear.

The questioner : Another question, our Shaykh. Since the process of tanning skins is permissible, meaning any skin that is tanned is pure, or does it only become pure? Is it permissible to kill wild animals in order to benefit from their skins? All wild animals, with the exception?

The Shaykh : Is it permissible to kill what?

The questioner : Killing wild animals of all kinds, including cats, including dogs, pigs, in order to benefit from their skins, tan them, and use them?

The Shaykh : If they are wild, it is permissible; otherwise, it is not. Because you included cats, and they are among the household possessions, and they are among the things that the Wise Lawgiver excluded from being killed.

The questioner : May Allah reward you with good.

The Shaykh : And you as well. Yes.