What I find alarming in this article is the following:
Most pesticide chemicals in commercial flea repellents are fat-soluble and are stored in the fatty tissues of the body, primarily in the liver and in the nervous system. As these chemicals accumulate over time, they negatively affect nerves, hormones, and immunity. Symptoms to lookout for include anorexia, cancer, colic, convulsions, deformity of sexual organs, depression, diarrhea, foaming at the mouth, nausea, seizures, stiffness, vomiting and weakness
So does that mean using flea control could be detrimental to your pets?