Bulldogs World

How much food grade Diatomaceous Earth do you give your bully. Do you mix it in with their food. I bought a bag from my local feed store "Southern States" and on the outside of the bag it does say in big letters "Food Grade". I started sprinkling it on my bullies three days ago for topical flea treatment and have heard of people using it for worming. I was wondering how and how much to give to my adult bulldogs. Thanks!