whats kinda funny about this comment is the fact that I have had multiple vets reccomend peanut butter in the congs. Actually isn't that much when you put it in a Kong and my dog was way under weight when it was suggested. No risk of cancer from a dog that gets more exercise than 99.9% of dogs in the world. And yes I can prove that. All my dogs are professional guide dogs, they run pheasants 6 months of the year and the other six months are spent training for the next season. I never heard peanut butter causes cancer in dogs, would like to see some documentation on that. The only real information on that fact is that some speciality peanut butters contain the sweatener Xylitol which is bad.