Muhammad, from Ali ibn Al-Sindi, from Safwan, from Abdur-Rahman ibn Al-Hajjaj, said:
I asked Him عليه السلام about footwear made from foxes or garments from them, may one pray in them or not? Imam عليه السلام said: "If it has been purified (lawfully slaughtered), then there is no problem with it."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 395