Tomcat Repellents Rodent Repellent Granules are engineered to safely and effectively deter mice and rats from entering homes. Featuring a no stink formula that is long lasting and rain resistant, these granules are tested and proven to prevent rodent entry, nesting and foraging. Through essential oil technology they deliver a smell and taste that rats and mice naturally hate, while remaining safe for use around kids and pets, giving you both protection and peace of mind.