FREE YOOS Essential Oil Dog Collar Posted On June 2, 2020 Get a FREE YOOS Essential Oil Dog Collar! No purchase required, no credit card required (we have a few questions, but otherwise no strings attached, no kidding). Valid for US residents only. Please allow 4-6 weeks for delivery. Offer available while supplies last.The YOOS™ collar is the first and only essential oil collar for dogs to help relieve occasional joint stiffness and maintain joint mobility.