Most experts agree that peanut butter is safe for most dogs in moderation. Jennifer Lesser shares facts on why moderation is warranted. Considering that myriad brands now exist, she shares the importance of reading labels and, whenever possible, avoiding ingredients like sugar or corn syrup, artificial sweeteners like xylitol, or other potentially harmful preservatives. Also, avoid peanut butters marketed as reduced-fat or low-sugar.
Source: The Spruce Pets, October 2019. Link.