If a sufficient dose is ingested, diarrhea is likely, and in some cases, vomiting may occur.
There is a small risk of aspiration pneumonia if the pet inhales some of the product.
Suggestions
It is best to avoid giving petroleum jelly to cats.
If ingestion occurs, monitor for signs of diarrhea or vomiting and consult a veterinarian if any adverse symptoms appear.
Note: even if labeled as safe, any food can potentially cause allergies. When introducing a new food, please feed a small amount and observe your cat for any allergic reactions.