1. Spot-on Treatments
While spot-on medications seem like they would only work on the spot they are applied to (in the same way a collar works), they are actually very effective at covering the cat’s entire body. The drops work by a process of translocation, by which the medication is spread over the body by way of the oil glands, and by the cat’s natural habit of cleaning itself (i.e., wetting its paws to clean its fur). Spot-on medications are not affected by bathing, swimming, or rain, and will kill and repel fleas for several weeks before reapplication.