Dogs are distinguished from humans by their skin which is much finer and thus more fragile: dogs skin comprises of 5 layers of cells corneas different from the human skin which comprises 9 of them.  The other difference relates to the pH. Human skin has an acidic pH of approximately 5.5. Human shampoos take this into account and are also acidic in general. On the contrary, the pH of dogs skin is rather basic (between 8 or 8.5). The human shampoos, even soft, will not respect the balance of the pH of the dog skin and it is consequently not advised to use them. Even for an adapted shampoo, it is necessary to avoid too frequent washings. A skin washed too often will become very fragile and sensitive to eczemas. One or two shampoos per month is a maximum frequency. In the event of local “accident”, you can always locally use a lotion “without rinsing”. The dry shampoos make it possible “to cleanse” and to scent the hair without wetting the animal and subjecting him/her to aggressive detergent agents.