A pet toy in provided in combination with a material for the evaporative delivery of catnip aroma. The evaporative material comprising substantially catnip oil, sunflower oil, and polyacrylamide, wherein the catnip oil and/or the sunflower oil are delivered by evaporation through syneresis. A number and size of openings in the pet toy housing are varied as desired to control the rate at which odor is allowed to permeate, and the amount of evaporative gel or rate of syneresis can control the duration through which the odors may be attractive to pets.