Staining between toes

My dog is six years old. Over the last two years she has been pulling at the hair between her toes on all four paws. This is also consistant with a staining developing in that same area, similar to that which can be seen staining from the eyes. This pulling at the hair can go on for hours with a resultant soggy mess. Does anybody know what is the driving force for this action? Is it somehow connected with the eye staining discharge? Is there a suggested remedial action?
Barry Collin

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