Beaphar IMMO Shield Spray For Cats, Dog, Rodents, Ferrets against Fleas, Ticks and Mosquitoes, 250 mlBeaphar IMMO Shield Spray For Cats, Dog, Rodents, Ferrets against Fleas, Ticks and Mosquitoes, 250 ml Beaphar IMMO Shield spray based on dimethicone (silicone oil) deactivates fleas, ticks, mosquitoes, lice and sand flies by mechanical action. Dimethicone forms a surface film that physically blocks the parasites joints and acts as a sticky trap. The spray effectively affects all life stages of fleas. The product does not contain chemical insecticides.