CorgiMum, for some reason I was thinking you are in the UK, I think the "mum" in your name made me think that. Now I realize you are in Canada, duh.
You and your vet are correct about the PH balance. Several of the Bio-Groom products are PH balanced. You also need to observe after bathing and grooming your dog, to see if they scratch or flake. I know the PH balance can be important, but also the type of brush and how often you brush your dog. I've heard of brushes or combs scratching the skin and causing irratations.