A few years ago, I also read somewhere that peanut butter is good for dog's so I gave a little bit of peanut butter to my doggie, she ate it and loved it and everything was fine. But, the next morning when I woke up, I noticed that her entire face (especially mouth area) was swollen badly and she was in pain and could not even eat anything so I immediately took her to the vet and the vet told me that she got an allergic reaction because of the peanut butter and the vet also told me to never give her peanut butter or even chocolate to her ever again. The vet also told me that pet owner's often forget that dogs are different from humans and out of love they give them everything that they eat but it can be bad for the dog's health.
Anyways, I learned my lesson.