Is it permissible to work in a factory that produces animal feed containing pork?

It is permissible to feed non-edible animals, such as dogs and cats, carrion, including pork, but it is not permissible to sell it. Sheikh Ibn Uthaymeen was asked about purchasing cat food that contains pork, and he replied that it is not permissible, because it is not permissible to buy pork. Accordingly, it is not permissible to work in the manufacture of foods that contain pork or carrion for the purpose of selling them, due to the cooperation in sin involved therein.