So, these pelts that them skinwalkers have. Can those things be destroyed like somebodies armaments, or does the pelt itself have some sort of magical protection on it?
They should be able to be destroyed like any other item. However, you will find it harder to destroy it while the Skinwalker has it in their possession, as they will defend the source of their power.
They also need to be in their human form in order to successfully target the totem.