"Topical preventives" refers to substances or products that are applied directly to the skin or outer surfaces of the body to prevent certain diseases, infections, or other health issues. Full definition
Simple oral or topical preventive treatments, administered once a month, can eliminate the risk in animals that do not test positive. (heartwormsociety.org)
It typically includes specialized shampoos or dips, topical preventives for fleas and heartworm, and regular vacuuming and cleaning of your dog's bedding. (pethealthnetwork.com)
It is well worth the price, however, to kill fleas and ticks without the mess of topical preventives or the hassle of oral medications. (businessinsider.com)