Dogs fed straight peanut butter as a treat or fed treats baked with peanut butter containing xylitol may certainly be at risk for harm, but a dog that eats an entire jar of xylitol-containing peanut butter a could quickly become very ill. If this occurred during the day while the owners were not home, it’s possible the dog could die before people returned. It's important to know that currently, no mainstream peanut butter brands have started using xylitol—only the three specialty brands listed above. Pet Poison Helpline has been given the information on toxic levels based on a pet's weight. The chart is available below for the product made by P-28. If you suspect Xylitol poisoning in your pet, please call your veterinary immediately!