In short, yes. Your dog can consume peanut butter. But you should keep a couple of things in mind before filling the Kong with peanut butter for your dog. To begin with: your dog should be fed peanut butter in moderation.  For instance, a tiny puppy should not be given more than half a teaspoon of peanut butter, small dogs should not be given more than one teaspoon of peanut butter a day, and an adult dog should not be allowed to have more than one tablespoon of peanut butter in a day.  Besides, ensure that the peanut butter does not contain xylitol as an ingredient. Remember that there are a couple of well-known brands of peanut butter, which contain xylitol, and you should avoid those at all costs.