Protect your pup with Sawyer Products Premium Permethrin Insect Repellent Treatment for Dogs 24 oz spray. Permethrin for Dogs aids in control of ticks on dogs up to 6 weeks. Sawyer Permethrin also controls fleas and lice for 35 days on dogs. This odorless treatment repels and kills ticks which can carry Lyme Disease and Rocky Mountain Spotted Fever, and lice. It does not harm any fabrics or finishes and can be used to treat seat covers, dog bed, kennels, and other fabrics. Sawyer Permethrin is effective for 6 weeks or 6 washings on fabric. Do not use on cats. Every Sawyer product you buy contributes to our common humanity, bringing Sawyer water filtration systems to people in need all around the world. Over the past 10 years we've teamed up with over 140 charities in 80 countries to provide long-term sustainable relief domestically, internationally, and in disaster situations. Together, we're saving millions of lives.