My first thought was maybe it was bit too much dairy all at once?
You're not a bad mom! How is Pitch feeling today?
For Henry's Kongs I usually mix mostly mashed banana (or whatever fruit I might have around... frozen blueberries, apple chunks), applesauce (unsweetened) and a dollop of yogurt together, and seal the ends with a bit of PB.
I hope he is feeling better today. Yes, I hate when the DH is right too! :-\
Poor guy! Clarence can't have PB (not sure if it's an allergy or what). I stick to 2 ingredients (banana and cream cheese, kibble and cream cheese...). I'd try it again with the smaller size...