TOXIC FOR DOGS

Xylitol is a sugar substitute that possesses 40 percent fewer calories than sugar and has been shown to help decrease cavities in teeth, among other things.  However, it is important to know that xylitol, even in small quantities, is very toxic to dogs.

The dental benefits of xylitol have been known since the 1970’s. Xylitol is not metabolized by the decay-causing bacteria Streptococcus mutans (S. mutans), making it nonacidogenic and thus noncariogenic (not decay causing). Studies have also indicated xylitol decreases the levels of S. mutans in both plaque and saliva. As a result, patients who use xylitol have demonstrated a reduction in decay.

Xylitol is slowly absorbed by the human intestines; as a result, it has minimal side effects on humans. Some may experience minor side effects, mainly stomach upset, although this generally occurs after ingesting large amounts of xylitol (four to five times the recommended amount for cavity prevention). There are studies that the body can adapt to higher dosages of xylitol and that symptoms can subside as the body’s tolerance increases.

While the dental community embraces xylitol for its cavity prevention, many people, including dental professionals, are unaware of its toxic potential – not to humans, but to dogs. While xylitol has little effect on insulin production in humans, dogs can experience a rapid and severe increase in insulin production after just a small amount of xylitol ingestion. A dog that ingests a xylitol equivalent of three to four pieces of gum is at risk for hepatic (liver) failure and necrosis (tissue death).

Dogs tend to be scavengers by nature and their likelihood of encountering potentially toxic substances in and around the house is common. The ASPCA web site lists a multitude of substances, many of which are harmless to humans but potentially dangerous to dogs. Chocolate, grapes, raisins, avocado, onion, and citrus fruits make the list. However, xylitol is unique in that it is contained within foods; as a result, consumers may not even be aware that a product or food item contains xylitol.

For dogs suspected of ingesting xylitol, early intervention is paramount. Prompt medical treatment for uncomplicated xylitol-related hypoglycemia can yield a good prognosis. Once Xylitol has affected the liver, it yields a much graver prognosis.

While veterinarians have been aware of the potential danger of xylitol to dogs for several years, that awareness has escaped most of the dental community – and the general public. This has become a more significant issue as more dental professionals promote products that contain xylitol for its human benefits.

It is important for dog owners to know the different foods and products, such as xylitol, that can be harmful to their pets. Make sure to keep these items out of a dog’s reach – and that includes the garbage. If you suspect ingestion of any of these foods, including xylitol, contact your veterinarian immediately.

Dr. St. Clair maintains a private dental practice in Rowley and Newburyport dedicated to health-centered family dentistry. If there are certain topics you would like to see written about or questions you have please email them to him at jpstclair@stclairdmd.com. You can view all previously written columns at www.jpeterstclairdentistry.com/blog.