Dog still has fleas after mixing and putting on the twice (recommended once every 28 days). After the first day I am still on the flea patrol and brush him vigorously every time he comes back in from being outside for only a short time. This dip was in addition to flea collars on both of them and spraying it on the carpet as well. I use Ultracide in my carpet and it does work for just about the whole season. I may have to do Ultracide again before the season in over it is a particularly bad year for fleas as we really did not have a prolonged freeze during the winter month which helps gold them at bay.