Hartz Shampoos and Sprays Cleansing, citrus-scented shampoo kills fleas and ticks through contact Includes one, 18 fluid ounce bottle Can be used weekly for preventative treatment, while cleaning and deodorizing For puppies 6 months of age and older To use, wet pet's coat thoroughly with water and rub shampoo into coat, ensuring not to get suds into the eyes. Massage from head to tail until coat is completely covered with a foamy lather Repeat weekly if necessary