Xylitol and Dogs: What You Need to Know

What is Xylitol?

Xylitol is a sugar-derived carbohydrate found in many low-calorie sweeteners and human-grade food products. Since it raises the level of blood sugar, or glucose, by 9-10 times less than pure sugar, xylitol is considered a healthier alternative. Xylitol not only looks and tastes like raw sugar, but is especially helpful for those dealing with medical conditions that necessitate the use of a sugar substitute, such as diabetes or dental decay.

Xylitol and Dogs: The Harmful Effects

In both humans and dogs, levels of blood sugar are controlled by insulin. Upon consuming sugar, glucose levels rise, triggering the release of insulin from the pancreas to the bloodstream. Here, insulin initiates a vital sugar-to-energy transformation, where complex carbohydrates are broken down and simplified into glucose. Unlike bulky sugar molecules, glucose is small enough to efficiently enter cells. To facilitate, as well as expedite this process, insulin binds to cells and initiates the absorption of sugar from the bloodstream.

One important distinction between humans and dogs is the consumption of xylitol. In humans, xylitol consumption does not trigger the release of insulin, a hormone which helps to remove sugar from the bloodstream. This is because the body recognizes the chemical structure of xylitol as a sugar alcohol, which cannot be digested. Thus, it travels directly to the GI tract for later excretion. In dogs, xylitol has the polar opposite effect. Upon consumption, xylitol is directly absorbed into the bloodstream. This triggers an excessive release of insulin, resulting in the removal of dangerous amounts of sugar from the bloodstream, or canine hypoglycemia. Within an hour or less, hypoglycemic symptoms can become noticeable. Because this process can happen so fast, xylitol is not only toxic to dogs, but potentially fatal as well.

Xylitol Poisoning Dogs: Symptoms to Look Out For

Symptoms of xylitol ingestion are analogous to those of a human consuming poison, such as trembling and vomiting. Because xylitol results in a profoundly reduced level of blood sugar, common symptoms also include those associated with extreme canine lethargy, such as low energy, weakness, and even unconsciousness. These are the most common symptoms:

  • Vomiting: Whether your dog consumes xylitol, or any other poison, canine vomiting is generally the first symptom. Take your dog to the veterinarian as soon as possible before additional symptoms arise. Upon arrival, be prepared to discuss your dog’s relevant health history, such as recent foods ingested and events leading up to the vomiting. To aid with diagnosis, give your veterinarian more information about the vomit – color, consistency, amount, and duration.
  • Fatigue: If your dog suddenly appears weak or lethargic under otherwise normal circumstances, hypoglycemia may be in an early stage of development. Examples of hypoglycemia-induced fatigue include difficulty walking, jumping, running, or even eating and drinking. Any basic physical action will look and seem laborious.
  • Trembling: If trembling, shaking, or shivering suddenly occurs in a seemingly ordinary situation, your dog may be suffering from extreme levels of low blood sugar. Before assuming hypoglycemia, consider whether or not fear, stress, or abnormal weather conditions contributed to the abrupt onset of canine trembling.
  • Seizures: In any case of a dog seizure, immediately call your veterinarian and request emergency in-home instructions. Once the seizing stops, take your dog in for immediate treatment.
  • Fainting: Fainting, or collapse, is a sign of more advanced hypoglycemia. The body is beginning to shut down due to extremely low energy levels. Be aware as loss of consciousness may follow.  

The majority of the above symptoms take place between 30 minutes to 12 hours after ingestion. Symptom severity is proportional, depending on the amount of xylitol to body weight. According to recent reports, hypoglycemic symptoms can be induced from 0.05 grams of xylitol to one pound of weight. Comparatively, a single stick of chewing gum may contain between 6 to 8 times more xylitol.

Xylitol and Dogs: Four Questions

Helping your veterinarian determine the proper diagnosis depends on the answers to these four questions.

1) What was the concentration of xylitol in the food?

2) How much did the dog eat?

3) When did the dog first show symptoms?

4) How much time passed before action was taken?

How is Xylitol Poisoning Diagnosed?

Xylitol poisoning is diagnosed by evaluating the presence of external behavioral symptoms, in conjunction with internal vital and chemical signs.

Vital Signs

  • Blood Pressure: This is measured through a blood pressure monitor, in which a sensor cuff is placed around the tail or one of the limbs. In dogs, as well as cats, normal blood pressure is between 120-130 mmHG. Low blood pressure may be an indicator of hypoglycemia.
  • Heart Rate: This is most accurately measured with a stethoscope, but can also be measured at home by placing your hand over your dog’s heart or inside top of the hind leg. A normal resting heart rate varies depending on size, with 60-100 bpm in large dogs and 100-140 bpm in small dogs. Hypoglycemia is associated with high heart rates.
  • Respiration: Normal respiration is defined as 10 to 35 breaths per minute. To quickly measure, count your dog’s chest movements for 15 seconds and multiply by 4. Faster breathing, or shortness of breath, is generally associated with low blood pressure and an increased heart rate.

Chemical Signs

  • Chemistry Profile: This test measures a wide number of chemicals and enzymes. It functions as an overall indicator of organ health.
  • Complete Blood Count (CBC): This blood test measures red blood cells, white blood cells, platelets, and hemoglobin. Hypoglycemia results in a low red blood cell count due to loss of electrolytes.
  • Urinalysis: This is a test that collects urine either by Cystocentesis, Catherization, or Mid-Stream Free-Flow. Ideally, your dog will be able to provide a voluntary urine sample so as to avoid invasive alternatives. The veterinarian will use the urine sample to check for the presence of glucose. Normal urine should not contain any amount of glucose, while abnormal, high-glucose urine can serve as a strong indicator of hypoglycemia.


Advanced forms of hypoglycemia-induced xylitol poisoning are typically treated with dextrose, a form of glucose which is directly infused through the veins. Prior to discharge, measurement of vital signs and chemical testing may be repeated. Once stabilized, continue to closely monitor your dog’s behavior at home.

Xylitol and Prevention

Positive Xylitol Consumption

In the event that your dog has already consumed xylitol, there are two steps that you can take in order to prevent symptoms from escalating as quickly.

Liquid Sugar

If you know your dog consumed xylitol, or is showing clear signs of hypoglycemia, quickly locate a high sugar liquid. Examples include corn syrup, maple syrup, and honey. If none of these options are readily available, prepare a 50/50 sugar water solution. Directly rub the high sugar liquid on your dog’s gums. Even though symptoms may visibly improve right away, this is only a temporary solution to counteract excessive insulin. As an additional note, do not pour the high sugar liquid directly in your dog’s mouth, as this could actually exacerbate the issue.

Immediate Medical Care

As with any poison ingestion, time is of the essence. As soon as your dog has orally absorbed the emergency liquid sugar, take your dog to the nearest veterinarian or animal emergency room. Depending on size and weight, try to not let your dog exert any energy, as this is already at a critically low point. Carry your dog whenever possible.

Unknown Xylitol Consumption

If you are unsure if your dog has ingested xylitol, check the label of the suspected food and measure his heart rate. Since xylitol consumption results in hypoglycemic symptoms, check if your dog is experiencing a sudden increase in heart rate. A rapid canine heart rate is considered any value over 100 bpm for small dogs and 140 bpm for large dogs. If you are ever unsure of the above, always err on the side of caution. Either call an animal-specific poison control hotline for immediate advice or simply take your dog in for emergency care.

Negative Xylitol Consumption

The best time to learn about xylitol is before anything bad happens. To safeguard your dog from needless suffering, these are a few suggestions.

Educate Others

The best way to prevent xylitol poisoning is to know what types of products contain xylitol and keep these out of reach. Further, if you have children, neighbors, or friends with dogs, spread the word about xylitol and its harmful effects. If time is available, consider labeling foods with xylitol, especially if you have younger children in the house who may forget. And anytime you host an event – such as a birthday party, barbecue, or holiday celebration, establish rules with your guests on what can and cannot be fed to the dog.

Establish Habits

If your dog is the kind that likes to sit and wait for food to drop, consider eating in a separate room. Depending on the size, strength, and agility of your dog, a gate may also work as a good alternative. Another easy routine is placing your plate in the sink after every meal – out of sight, out of mind. To prevent your dog from getting into a purse or backpack, establish a habit of not leaving them open or unzipped on the floor.

Know the Numbers

Know and write down all important phone numbers in case of a pet-related emergency. Make sure these are kept somewhere visible or memorable. Here are the three most important numbers you should write down: your veterinarian, the nearest animal emergency room, and an animal-specific poison control hotline. If you ever move to a new address or leave your dog with a caretaker, be sure to either update or discuss the location of these numbers.  

Lock It Up

While this may seem extreme to some, a child-proof cabinet lock is much cheaper than a trip to the veterinarian. More importantly, it gives you the peace of mind that your dog cannot poke through cabinet doors and break into food items potentially containing high concentrations of xylitol. Besides cabinet doors, there are also trash cans on the market, which are equipped with automatic locks or motion sensors. Either of these options will be more secure compared to traditional cabinet doors or standard trash cans.

Xylitol Products

Food and Drink: So many processed foods and drinks contain xylitol. More often than not, if the product claims to be “low fat”, “low calorie”, or “sugar free”, xylitol is present. To be safe, double check the label. To be extra safe, if it’s not dog food, don’t feed it to your dog!

  • Candies (ex. Lollipops)
  • Chocolate (ex. Organic Raw Chocolate)
  • Condiments and sauces (ex. Ketchup)
  • Cookies and baking mixes (ex. Chocolate Chip Cookies)
  • Flavored water and drink powders (ex. Energy Drink Mix)
  • Gums and mints (ex. Spearmint Gum)
  • Honey and sweeteners (ex. Sugar-Free Honey)
  • Ice cream and yogurts (ex. Non-Fat Greek Yogurt)
  • Jams and syrups (ex. Strawberry Sugar-Free Jam Preserves)
  • Peanut and nut butters (ex. Almond Butter)
  • Power bars and protein powders (ex. Pure Plant Protein)

Toiletries: Xylitol is a common ingredient in products that are chewable, flavored, liquid, or that advertise as being “sugar-free”.

  • Mouthwash (ex. Dry Mouth Mouthwash)
  • Nasal Spray (ex. Saline Nasal Spray)
  • Toothpaste (ex. Antiplaque Toothpaste)
  • Vitamins (ex. Chewable Vitamin C)

While it’s fine to feed your dog human food once in a while, there’s a huge difference between feeding your dog a plain piece of meat and one that is covered in toxic, xylitol-containing barbecue sauce. Thoroughly cooked meat without the addition of sauces or spices is the safest bet. Outside of the kitchen, it is sometimes seen as cute or playful when a mischievous canine begins to sniff around odd or unusual belongings. But, a dog’s nose in a school backpack with a pack of sugar-free, xylitol-containing gum, could lead to a not-so-funny trip to the veterinarian. No matter the case, be consistent with your response. As an example, work to turn every instance of wrongful chewing or harmful eating into a training opportunity, and reward your dog with corrective treats. Further, make sure your dog is receiving regular daily nutrition and proper exercise to avoid hunger or anxiety-related mischief.  




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