Hartz® Just For Cats® 100% Pure Catnip. New & improved! No Dogs Allowed!™ Great for refilling toys! Every toy fills a need. Play hunt pattern. Play swat pattern. Play share pattern. Catnip facts: Hartz® catnip will help to stimulate cats, increasing play and exercise. You will see them sniffing, licking and chewing at the catnip. The effect will last around 10 to 20 minutes. It will take approximately 1 to 2 hours before the cat will respond again to the catnip. Hartz® and other trademarks are trademarks of The Hartz Mountain Corporation. www.hartz.com.