Amber is a fossilized tree resin which contains aromatic chemicals called terpenes which effervesce when amber is heated or rubbed and produce a resinous aroma. Nevertheless, electrical charge is generated due to friction that is created when amber stone is rubbed against the fur. These two (aroma and electrostatic) properties help effectively cope with parasites such as ticks and fleas. Ambertick© - Natural amber necklaces for dogs and cats.