This is a terrible year for my pets and I with fleas. Since it was a wet spring, and hot summer, the fleas have been rampant here. My back yard is a mixture of woods, swamp, and sand, so that's where they come from I think. Since my dogs are out alot, they keep getting loaded with fleas, no matter how many times I comb them, wash them, or put flea repellant on them. And in return, when they come in my cats get the fleas off the dogs. It doesn't matter if the dogs are out there in the yard for 5 minutes, or 5 hours, they still get alot after having other fleas removed.