(Cut-Heal Animal Care) Zonk-It! 35 insect control spray provides up to 35 days protection from face flies, horse flies, horn flies, mosquitoes and gnats. Kills fleas, ticks, lice and louse eggs. Gentle, water-based formula ith aloe vera and lanolin for sensitive skin. Safe for horses and dogs. Zonk-It! 35 insect control spray contains 0.50% Permethrin.