Posted by Theresa (Mpls., Mn) on 03/25/2015
I must respectfully disagree with your proclamation.
First, the basics:
For both humans and dogs "A highly important component of skin is what is called the acid mantle. This is a lightly acidic layer that covers the skin, serving as a barrier to protect the porous topmost layer of the skin, the stratum corneum, from environmental contaminants such as bacteria and viruses. The stratum corneum is responsible for keeping the outer body well hydrated, by absorbing water and not allowing excessive evaporation to occur. When we bathe, using soaps and shampoos, we wash away this layer of acidic oil."
Next: "The acid mantle can also be defined as the relative pH balance of the skin. The pH scale ranges from 0 to 14, with levels less than 6.4 considered high acidity, and levels more than 6.4 considered high alkalinity. The normal range of skin pH levels for humans is 5.2 to 6.2...Depending on breed, gender, climate, and the anatomical size on the dog, the pH levels range from 5.5 to 7.5, ..."
"...if a shampoo that is formulated for human skin is used on a dog, the dog's acid mantle will be disrupted, creating an environment where bacteria, parasites, and viruses can run rampant. Unknowingly, many pet owners will repeat washings of their dogs because of the smell caused by a proliferation of bacteria, making the problem worse as the skin's acid mantle/pH level becomes more imbalanced."
Because dog shampoos can be very expensive, and human shampoos are usually very affordable, the solution is to give your dog an ACV rinse after the bath to restore the acid mantle and balance the PH of the skin.
And, about the Selsun Blue not working on the fungal infection on the skin of your dog, the working ingredients in Selsun Blue are selenium sulfide [anti-fungal]or salycilic acid [anti-bacterial] in either 1% or 3% concentrations. The VetTrust shampoo from Walmart has chlorhexidine gluconate [anti-bacterial] and ketoconazole [anti-fungal]. It would seem that the yeast/bacterial infection on your dog was simply not sensitive to the Selsun Blue, but was sensitive to the VetTrust product. What works is what works, however a far less expensive and super effective approach would be Ted's Anti-fungal/Anti-staph remedy.