All Natural Viet Nam Made Cotton Knot and Leather Tug Toy Newest to our line of Natural Leather Toys are these sturdy tug toys suitable for large breeds or medium size dogs that like a big bite. They're made of multiple layers of thick vegetable tanned leather (from cattle raised in the Viet Nam), cotton thread, and natural cotton rope. Natural fibers offer a satisfying chewing surface that cleans teeth and stands up to chewing much better than plush or woven fabric toys. These heavy leather toys are toys, not edibles, and should not be left with aggressive chewers unsupervised. These make great target toys and/or rewards for working dogs.