A frozen KONG will take your dog longer to consume and give your dog more of a challenge, thus providing them with greater mental stimulation. However, if your pet is still young or this is their first KONG, you can give it to them right after you make it and then increase the difficulty as your pup gets older and more experienced with the toy.A lot of these stuffing ideas contain peanut butter which most dogs love, however it is essential to make sure that you only use dog friendly peanut butters in the recipes. Ensure that any peanut butter you give your dog is natural, without added sugar or salt, and particularly not xylitol, an artificial sweetener which is highly toxic to dogs even in small amounts.