Skin pH was usually alkaline with the highest values on the lower back and tail.
Following anaesthesia, TEWL and skin hydration were significantly lower on the head, upper back and footpad, and upper back and elbow respectively, while skin pH was unaffected by this procedure.
While measurement of pH would seem to be valid anywhere on the body in anaesthetized dogs, regional factors should be considered when interpreting TEWL and skin hydration values and when treating regional skin diseases in veterinary practice.
Source: Oh, W.-S. and Oh, T.-H. (2010), Mapping of the dog skin based on biophysical measurements. Veterinary Dermatology, 21: 367–372. doi: 10.1111/j.1365-3164.2009.00841.x
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