and it worked!!
The dog is an elderly shihtzu. For the last 5 or 6 months she has had yellow, greasy/waxy substance at the base of most of her nails. The nails were normal, but the skin at the base of the nails was irritated and so was the skin between the pads. She had 3 baths (one by me, two at home) with Head and Shoulders Sensitive. And it's gone. The vet told the owner it was a fungus.