Good point. People shouldn't inhale it either. I didn't think it worked that well but I used other stuff when the DE did not work fast enough to suit me. I bought the mud looking stuff with the nematodes next ( I think ). Then much later we salted the dog pens, watered them down good, kept the dogs elsewhere till water and disolved salt were well absorbed ( dry ). Grass was dead for about three weeks ( looked horrible ). Grass came back after that and looked great. No more fleas !