I agree use his favorite treats. But if you want something to put in his kong either 1/2 plain yogurt and 1/2 pumpkin, mix it together put it in the kong or you can get the kong shaped ice cube tray and freeze it. That way you can make a number of them at a time. And keep them in the freezer to use anytime you need one. Or you can use peanut butter and freeze it. It lasts longer that way
