¼ cup cheddar cheese, grated¼ cup Swiss cheese, grated2 tablespoons vegetable shortening½ teaspoon brewer's yeast½ cup oatmeal, toastedCombine cheeses, brewer's yeast and shortening. Using plastic wrap, shape mixture into a log about 1 inch in diameter and 8 inches long. Roll log in toasted oatmeal. Refrigerate. Slice into half-inch rounds and serve.

Source: The Dog Catalog, 1978 Grosset & Dunlap