However, some dogs may develop an allergic reaction to the proteins in peanuts, just like humans can. The reaction occurs when the dogs immune system perceives the peanut protein as a threat, triggering an allergic response.
Peanut butter allergies in dogs are the results of dogs being allergic to peanuts or having a reaction from an ingredient in the peanut butter, which is known as xylitol. Published

- Still, it is recommended to be aware of the clinical signs to know what to do in case they do occur. A peanut butter allergy is usually not severe, and the clinical signs are similar to those of other food allergies.
- Peanuts - Although their high fat content can cause pancreatitis if given too frequently, peanuts are a relatively safe occasional snack for dogs, usually offered in the form of peanut butter. It is important to check the ingredient label for sugar and sodium levels, as well as to ensure that the ingredient xylitol is absent as xylitol can cause a drop in blood sugars in dogs that is often fatal. ... Food allergy - A food allergy is a response of the canines immune system to defend itself against an amino acid that it perceives to be a threat. Any food can cause an allergic reaction, but some foods, such as beef, dairy, chicken, and eggs tend to cause allergies in canines more often than others.