The final installment of common myths I hear about fleas
Flea Myth #5: “Product X was ineffective because the environment was so infested.” The observed effect of a product, measured in terms of the number of fleas that can be found on a pet, may indicate that this is true in the case of a heavy flea burden. However, it is all a matter of percentages. If the product is even 90% effective, the manufacturer can claim efficacy. But, even leaving 5% of hundreds or thousands of fleas will be too many for a lot of dogs or cats to tolerate. The product may appear to perform adequately with a low flea burden in the environment, but not so well with a heavy burden, even though it kills the same percentage of fleas in both cases.