@Oleanderz, I live in the South where it is hot and flea-friendly dang near all year round. In the beginning when I switched to just Sentinel, I did see a couple of fleas on my Bruno for about a month or so (it doesn’t kill the adult ones). Then since September, when we started using the Spectrum (and it started getting “cooler” in GA terms of cool), he’s been flea-free. I have continued using Sentinel Spectrum, in fact just bought the next batch to last us till September of this year, and I plan to use it during the Spring and Summer. Don’t anticipate any problems, and if there is an occasional stray flea, they usually go away quickly unless I manage to snatch it up and squish it (though they are SO hard to squish).
I probably wouldn’t use any topical unless it was natural (like Cedarcide or Diatomaceous Earth).
