Wild and wacky plush toys that come in the shape of a sloth! Silvervine creates a similar reaction to catnip but affects more cats! Silvervine sticks are a no-mess alternative to loose catnip! Play also relieves anxiety, stress, and boredom. When indoor cats do not have toys to play with, that is when they supplement their playful instincts with anything they can find around the house; curtains, toes, shoelaces, etc.