After a little searching, I found the ingredients:
Aqua, Sodium Laureth Sulfate, Cocamide DEA, Sodium Chloride, Alcohol Denat, Glycol Stearate, Cocamidopropyl Betaine, Glycerin, PEG-7 Glyceryl Cocoate, Triclosan, Parfum, Citric Acid, Zinc Ricinoleate, Panthenol, Sodium Lauroyl Sarcosinate, Tetrasodium EDTA, Tetrahydroxypropyl Ethylenediamine, Benzyl Alcohol, Magnesium Nitrate, Methylchloroisothiazolinone, Magnesium Chloride, Methylisothiazolinone, CI 19140, CI 16035.
Looks like a basic shampoo. I can't see anything in it that would make it a better cleaner than any other shampoo. It's very likely that the whole "Fox Poo" is just marketing appeal.
I hear you on the badger poo. We've got a dachshund & we live in Wisconsin (home of the Badgers) and our doxie seems to find badger poop every summer. We only use water on washing him and let him sit outside to air out.