Wondercide - Flea & Tick Shampoo for Dogs and Cats - Flea and Tick Killer Treatment with Natural Essential Oils - for Pets Over 4 Months - Powered by Plants - 12 Fl ozKILLS AND REPELS FLEAS AND TICKS BY CONTACT. This easy to use, powerful shampoo is the perfect first step in killing and repelling fleas and ticks during an active infestation. LAB PROVEN. VET APPROVED. Powered by plants, this liquid shampoo is proven to exceed the same effectiveness standards required for conventional flea and tick control shampoos. It kills pests and is a great first step to protect your pets when dealing with an active flea or tick