Had a major problem with fleas. Used Raid flea spray and foggers, shampoos, a white dust (cannot think of name), insect control fertilizer, yard sprays and nothing worked. I have been using this since about 2016 and it works awesome! My Uncle told me and I was skeptical, but glad I did. Definitely well worth it. Even works with other dogs all around us. I have no worries it even helped one of my dogs get rid of her worms I used to see in her fecal matter. Saved me vet visits and other pet med Bill's.