I am sorry that you are having a flea problem with your dog. When addressing a flea problem it is also important to clean and treat the home. Below I have made some recommendations that have worked for many of my patients that had a really bad flea problem. It is okay to start this now after doing the Zodiac on the 13th.
1- Frontline or the generic which is called Pet armour; you can buy this in your local pet store, walgreen's or walmart, costco, online, etc. Apply once a month for at least 3-4 months or all year around if in a warm weather area.
2- Capstar pills, once a day every other day for 2 weeks.
3- Vaccum the home and wash all bedding.
4- Treat the home with a powder called Fleabusters, you can buy this online (amazon.com).
My goal is to provide you with excellent service - I hope I've provided the information you were seeking, if you feel you have received anything less, please reply back as I am happy to address follow-up questions. Kindly rate me when you are done.