Dog poop in particular is not fertilizer like cow manure. Contrary to popular opinion not all poop is created equal. Cow manure is in fact good for vegetation because it started out that way. Dog's diets are very different. Most dog foods today are composed of beef, chicken, and/or pork products. This is a high protein based diet that creates a very acidic excrement and can leave your lawn, well . . . not looking so good.