Treatment is still an option for risk takers, but we can only see what kind of risk they're taking if we compare the efficacy of flea repellants with a lack of treatment. Although it depends on the ingredients
of your medication, studies have shown that flea medication with permethrin and imidacloprid, like K9 Advantix
, are 98.43% effective over the 30 day period for which typical flea medicines encourage between reapplications.
This means that If before applying medicine, your pet had a measly 10% percent chance of infestation this winter. Without adjusting the percentage of the medication, you are 5 times more likely to suffer from an infection if you stop using flea medications to protect your pet. In actuality, the risk is much greater than that, as 98.43% effective assumes an environment where pets are subject to fleas. If the winter does drop the risk to 10%, it would make more sense to make the comparison of 10% to 0.02%. That's a heck of a gamble, if you ask me.