I don't think a refined over-processed flour is good for dogs. Better stick to whole wheat, it's better for humans as well.

I would not use a all purpose flour. I would go to the store and either buy whole-wheat or a gluten free flour (such as garbonzo bean flour). I don't like feeding my dog any grain products and garbonzo bean flour is a great subsitute.

Yes - dogs should not eat flour at all.

I would not use all purpose, this will explain why:

http://www.three-little-pitties.com/white-flour.ht...

I wondered the same thing before it is so easy to forget how different their systems are and seems like a simple thing. Who knew?