I guess I got lucky the summer before last. We have 3 cats and it seemed like out of nowhere we went from 0 fleas to the equivalent of the Chinese flea army in less than a month. At first we just bathed them and that did not seem to do anything. Then tried collars again to no avail. Then she red online that vacuuming all the carpet every day could help. We started doing that twice a day, I did it in the morning before work and she did it in the evening after work. The numbers dropped pretty good but there was still the occasional flea sighting. We got one of those junky little lighted glue traps (I thought it was kinda dumb and would not work) amazingly though it seemed to clean them up pretty efficiently. After about a month we were not seeing fleas anywhere and there were no new ones in the traps.