Does anyone use "FOOD GRADE DE"...... in particular Perma-Guard Food Grade DE?...
Thoughts, opinions and/or experiences PLEASE

I have a new neighbor and they have an outside large dog,appearently also has fleas....since I suddenly found 2 fleas on one of my girls, and they haven't had a flea for the last 2.5 years....

I need to keep the fleas out of my yard...HELP!