Chew Guard Spray is a highly concentrated exclusive formula for preventing chewing in dogs and cats. These naturally working ingredients are SAFE, NON TOXIC and WILL NOT BLISTER OR BURN. Chew Gyuard will not stain. Chew-Guard ingredients are solubilized and evenly dispersed throughout the formula. Upon contact, rapid drying occurs leaving a tacky and concentrated residue which has a repulsive taste to dogs and cats.