Hartz offers a chance to get a free Nature's Shield Flea & Tick Dog Shampoo through their product testing and feedback program. Interested participants need to register and answer some questions on the linked page for a chance to be selected. Those chosen will receive the shampoo for free, with no payment information required. 

 Effective with natural oils: Flea and tick dog shampoo effectively kills fleas, ticks and flea eggs on contact and repels mosquitoes for up to 24 hours Herbal ingredients: Maximised botanical protection against fleas and ticks with effective herbal ingredients: cinnamon, citronella and rosemary oils Coat care: Cleans, deodorises and nourishes your dog's skin and coat with vitamin E. Free from parabens, dyes and alcohols.