قال الشيخ رحمه الله ولا تجوز الصلاة في جلود ساير الانجاس من الدواب كالكلب والخنزير والثعلب والارنب وما اشبه ذلك ولا يطهر بدباغ
The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, said: "It is not permissible to pray in the skins of other impure animals, such as the dog, the pig, the fox, the rabbit, and anything similar to that, and (their skins) are not purified by tanning."