lol foxes eat a high protein diet, mixed with acidic fruits - humans eat a similiar diet and their poop smells just as bad. (fortunately Our current dog doesn't roll in either the former or latter and doesn't eat the latter - and that's a huge deal in an area prone to traveller scum)

The best thing is to wash the dog in teatree oil dog shampoo. You can also get teatree oil sprays as well, that might cut the smell down enough for you to get close enough to weild the warm water and shampoo Mjolinor :-)

teatree oil is pretty much the only thign that works effectively on fox crap :-)