I Googled "German Hoof Dressing" and got a bunch of hits; even one with pictures of a product in a white with blue plastic container.
You might get lucky and recognize the product by description.
If it were a U.S. product, I'd say your chances of finding it are Slim and None, since anything that old would likely have some ingredient in it that is deemed "bad for human consumption" and gets taken off the market.
Hope you find what you're looking for:)