Most bar soaps contain detergents, which can cause gastrointestinal irritation (including vomiting and diarrhea) if ingested. If the soap also contains essential oils (such as lavender, for example), it is possible that minor central nervous system depression could occur, depending on the concentration of oils and other circumstances of exposure. Certain soaps are made with glycerin or other emollients, which can have a cathartic effect—causing loose stools or diarrhea. If gastrointestinal signs become persistent, they could lead to dehydration.
In addition, if a large portion or the entire bar of soap were to be ingested, it could potentially lead to obstruction in the animal’s gastrointestinal tract. Because of these concerns, we advise keeping your decorative soaps in an area that is not accessible to your dog.