Regarding Basar V’chalav with basar neveiloh you cannot guarantee that all the pet food comes from neveilo.
My understanding of basar v’cholov is that it is dependent on the species of animal, not whether the individual animal is kosher. In other words, a cow (or any other kosher mammal) can be subject to basar v’chalav regardless of whether it was properly slaughtered or not.
Or am I mistaken in this?
The Wolf (who, like all canines, is clearly NOT subject to basar v’chalav).