The goal of the work is to establish the values of skin pH of dogs in the physiological state and in the pathological state as pyoderma is. The research was made on 40 adult dogs; 20 healthy and 20 with skin changes. From the changed places of skin the microbiological smears were taken and pH of the skin in those places was measured. The dogs with pyoderma were treated with surface-acting agents as shampoos of known pH reaction. Before and after the treatment the pH of the skin was measured. It was noticed that the pH of the dog skin is higher than human and other carnivores; it was established as pH 7,395. It was discovered that in the pyodermal states the skin pH is elevated up to 8,109. The usage of a surface-acting agents caused normalization of a skin pH.

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