I usually give my puppy a kong full of kibble/treats mixed with peanut butter and frozen if I'm going to be out of the house for a while. I was wondering how much peanut butter is too much, and if there are any other alternatives to cement food, etc into her Kong that can be frozen? I saw yogurt suggested and think I'll try that, but any other suggestions? As for yogurt, any specific kinds, should I avoid flavors or sugar free? Thanks!