Yes, but such formulas generally work best for relieving itchiness rather than cleansing. Grind uncooked oatmeal into a fine powder and mix with water until you develop a milky white solution. This can then be applied topically on your dog. The solution can provide much-needed relief, but it won’t offer the moisturizing or the protective traits of quality dog shampoos. What’s more, it won’t last very long and should be used immediately after creation.