That's fair enough... But having said that, I am a qualified vet (am not working in practice as I developed a neurological disease several years ago and then as a "bonus" fractured my spine three years ago but I still maintain close links with a good number of former teachers, mentors and colleagues) - have consulted other vets (including asking them to test for me) and in development & testing have spoken several times with a specialist dematologist I know.
And yes...would agree that if you were slopping something with a pH of a soap bar (as in - the substance of the actual bar....not entirely sure that makes sense, but I can't think of how better to word it and hopefully you'll get where I'm coming from!) all over a dog's coat, you might be asking for trouble...I say "might" - but in reality unless you've got a super sensitive dog, or you're constantly bathing him/her - pH really isn't (in my opinion and research) quite as crucial as it's made out to be.
I instruct (or at least suggest! to my customers) that they thoroughly wet their dog's coat first - and then apply pre lathered ... Is more educated guesswork and observation than quantitative measurement, but for my large dogs, I'd use about 3L of water to wet their coats first - and with lathering up the bar before applying I'd use perhaps 100ml of lather for the whole dog. My calculations are never going to be exactly on the mark as I'm making a few assumptions regarding water pH, behaviour of the soap lather in solution and such (it's not going to behave quite as a true aqueous solution I'd guess, and being only a weak base complicates things too) - but for the purpose I need and given the wide range of variation in dog skin, I'm happy enough using it. And with that, using the soap in this manner & those approximate concentrations does effectively lower the pH to somewhere in the range of doggy skin levels and still gives a good clean and condition. (The pH of the soap straight up is higher - e.g. the drop of water on a pH strip test comes out at around 8.5-9)
Added: Hmm...reading that back perhaps isn't the clearest what I'm trying to say about my pH (is late afternoon here and it's been a long day after a long night...!) The pH of these bars IS around 8.5-9. The pH of my diluted lather (both with pH strip, and calculated based on bar pH & approximate dilution factors) comes in between 6.9 & 7.2
Hope that clarifies a bit - and also why I'm entirely comfortable with it being used on my own - and other peoples' - dogs?