It looks like cooler weather is on the way.  However, here in Texas this will not decrease the flea problem. The adult fleas you see on your pet represent approximately 5% of the total flea population, and are only the tip of the infestation iceberg.   Fleas can live in the pupae stage of their life cycle for up to 180 days despite cooler environmental temperatures.  This is why we strongly recommend year-round flea prevention.
There are many options available with flea prevention products.  Some are oral and some are topical.  Your veterinarian can help you decide which product will work best for your pet.  We do recommend that you purchase these products through your veterinarian’s clinic, as products purchased at warehouse and discount stores cannot be guaranteed as to their efficacy.  Here is a link to help better understand the life cycle of fleas