Pure wouldnt need other breeds mixed it to them. Even if they started from other breeds that would of been bred out decades ago. If they have feathered feet then those breeders are selling mutts as pure bred. I wouldnt buy any stock that had feathered shanks period
I wouldnt keep anything with feathered feet as those are bym. As wyandottes shouldnt have feathered shanks at all. As for smut..im not even sure what that is