Contains a high quality domestic D-limonene, which is the natural oil from citrus peel. This natural oil has been known for its ability to be used as a great alternative to pesticides and the relief given to pets with FLEA & TICK infestations while reducing the itching associated with it. For dogs dilute 2 oz into 1 gal of water and rinse. For cats dilute just 1 oz per gal of water and rinse.