Working with dogs every now and then I do bring a few fleas back home where I live with 6-7 dogs, so any contamination can take big proportions very quick and it's something I'm really dreading. Thankfully this doesn't happen too often and I've to admit using chemical anti-fleas as to stop any propagation as quickly as possible and while I'm not very happy about using these products they've worked each time. It is so difficult to source efficient and less harmful products... When I came across Deneem's advertisement I ordered a pouch in anticipation, and I got to try and use it within a month of purchase. The disappointment has been huge.. As said in the description it is tricky to use ( a pity there's no video, even a bad one the link provided doesn't work.. ) and the amount of dust it's triggering everywhere in the house is overwhelming : all window sills, all plants, even the windows themselves get covered in this very fine, white dust each time you're using the product, and each time the dogs snort after having been powdered up. My dogs have very short hair and I found it difficult to assess if I was using enough/too much, very difficult to make sure you're using it everywhere from tail to toes. When I 1st realised I'd brought back a few fleas from work I powdered all my dogs, even those who didn't seem to have any yet, I powdered the sofas, their beds.. Then did it again after 3-4 days and so on, but after a couple of weeks of this I had to admit it wasn't working at all, I'd brush up all the dogs every 3 days before applying another treatment and would always find live fleas, and i eventually had to give up when it got obvious this was getting out of hands. By that point all my dogs had fleas and I had to treat them all with spot-on to finally get rid of the fleas for good. I will keep looking for alternative options, but I'll be more careful to use something that has already been proven, a product witch has already been reviewed positively and with maybe more credentials than the sole seller's praises. It took me weeks to get rid of the white dust all over the house.