My dogs have never had fleas before. There have been alot of stray cats coming around and thats where i think they may have gotten them from? anyways my 3 dogs have fleas pretty bad. I washed them all in flea shampoo, sprayed down the entire yard with bug killer, and took apart 2 of the dog houses (plastic store bought ones) and thoroughly washed them and sprayed them with some bug killer as well. Well the flea problem for those 2 dogs is gone my 3rd dog has still got fleas. He is the one that i didnt take his dog house apart because its one i built made of wood. it has that wood shavings bedding inside. I fogged his dog house and also sprayed it down and the surrounding area with bug killer and he still has fleas. any suggestions?