What Happens If a Dog Eats Petroleum Jelly?

According to the American Society for Prevention of Cruelty to Animals, dogs that eat petroleum jelly sometimes experience gastrointestinal upset, such as stomach aches, vomiting or diarrhea. In addition, there is a very small possibility of pneumonia if the balm is taken into the lungs while being eaten or vomited up from the stomach, according to the ASPCA. The ASPCA explains that the petroleum in the product causes the distress.