The ingredients are easy to acquire, most being ready-at-hand in the home, and most recipes are for single use, meaning there’s no need for storage containers. You can try a new one each time you wash your dog. Exactly how to wash a dog is a different matter. As anyone who has tried can tell you, convincing your dog to submit to a bath can be a challenging proposition. Thankfully, making your own dog shampoo at home is only as complicated as you want it to be.