Effective Spot on for Dogs: Vivaldis VI-FI Forte 1.34 ml offers a powerful spot-on solution for effectively preventing and controlling flea, tick, and chewing lice infestation. It helps to control flea allergy dermatitis in dogs weighing from 10 to 20 kg Quick & Easy Spot-On Application: The solution is simple to use. The convenient applicator makes it easy to apply the treatment directly to your dog's skin, minimising mess and fuss. Waterproof Formula: Our waterproof formula means your dog can still enjoy baths, swims, and outdoor adventures without compromising the treatment's effectiveness. Monthly Flea & Tick Defence: A single application offers up to 30 days of continuous protection, ensuring your dog stays comfortable and itch-free.This solution acts on all stages of fleas and ticks, from eggs to adults, and helps to provide protection against lice infestations and potential health Direction for use: Apply Spot on at one point on the shoulder blade of the dog directly on the skin by parting or clipping the hair.