You can buy animal poo wormeries but they are just the same as the others. You donot add anything other than the excrement and the worm food. It is not for use on veg, however as I said on an earlier post if you have ever had veg from Africa and I am including Egypt and Israel in this. You will have eaten veg grown in nothing but whatever they can find ie. human, camel, goat and dog just to mention the ones I can remember!