What is the ruling on treating nerve weakness by anointing with wolf fat?

The meat and fat of a wolf are impure (najis) and forbidden (haram) according to the majority of scholars. The general principle regarding treatment with forbidden and impure substances is prohibition, due to the forbiddance of seeking remedy through what is unlawful. However, if there is a necessity or a recognized need, and its medical benefit is proven, it is permissible to use it for treatment, because the benefit of health and well-being is more complete than the benefit of avoiding impurity. Jurists have differed on the permissibility of treating with a dead animal (maytah) when there is a need.