Just asking is there ever one flea ?.My dog has just had them from fighting with hedgehogs. Has taken 2 weeks to get rid . Did spot treatment first after bathing her with flea shampoo and when dry again. Then a flea collar, flea spray for her basket , washed all bedding , sprayed the areas she lies in , and round skirting boards. Brushed her well in between times . A nightmare really --but hopefully now clear again and hedgehogs into hibernation !!!!!Good luck.