
Ahhhhh that gets confusing.
Why do you want to feed mixer or pasta? Dogs dont need carbs like those (in fact, nor do we but thats a totally different post :D).
Feeding those things will do what? Well mostly, it will just create dog poo, it may give them a bit more energy but theres nothing in mixer or pasta that they need so its going ot come out the other end.
The problem with it is, it will obviously be a part of their ration and as such take the place of other food. And that other food may be more nutritious.
My dogs only get pasta when i have been a fool and forgotten to defrost something.
So if you can feed a good variety of raw with veg (better off blended than just frozen), including meaty bones, you have no need to feed anything else. No need to supplement, although some of us do, i chuck in a bit of keepers mix from time to time, sometimes some vit e and epo for my allergy boy...nothing religiously added though....
If you take out some of that good varied raw diet,a dn replace it with processed carbs, then you might need to supplement and i wouldnt know where to start there. You are making it far more complicated than it need be.
I dont think it would hurt if you threw in some pasta from time to time, but there is no need for it, its the same as it does no harm to throw in some crisps into your own diet, for the variety ...... not for the nutritional value.