Can peanut butter cause a runny bum in dogs? I gave George some in a Kong yesterday as he was really restless and ripping up stuff and nicking treats out of the kitchen cupboard. The only thing he had that he hasn't had before is the PB. So I don't know if I gave him too much PB or whether it is was that on top of the carrot, the bull bit and the cow tendon that he also had in the space of about an hour. His poo looked like chicken korma sauce.