5 Toxic Foods That Can Make Your Shih Tzu Sick (Even Kill Them)

Every Year, Thousands of Dogs Die From Foods Their Owners Thought Were “Just a Little Treat”

That innocent piece of sugar-free gum? One grape? A small piece of onion from your pizza? For a small Shih Tzu, these “harmless” foods can cause kidney failure, seizures, or death within hours. Your kitchen contains hidden dangers you need to know about right now.

Watch the complete video above for visual identification of toxic foods and emergency symptoms.

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Quick Navigation

1. Onions: Red Blood Cell Destroyers
2. Xylitol: Artificial Sweetener
3. Chocolate: The Well-Known Danger
4. Grapes & Raisins: Mystery Toxin
5. Avocado: Multi-Component Toxicity

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1. Onions: Silent Red Blood Cell Destroyers

Understanding Onion Toxicity

Onions—along with related allium family members including garlic, leeks, chives, and shallots—contain compounds called organosulfoxides. When dogs consume these plants, their bodies convert organosulfoxides into substances that damage red blood cells.

The Mechanism of Damage

Oxidative Damage: The toxic compounds derived from onions cause oxidative damage to red blood cells. This damage compromises the cells’ ability to carry oxygen throughout the body.

Heinz Body Formation: Damaged red blood cells develop abnormalities called Heinz bodies—clusters of denatured hemoglobin visible under microscopic examination. These damaged cells become fragile and prone to rupture.

Hemolytic Anemia: As damaged red blood cells break down faster than the body can replace them, hemolytic anemia develops. This condition means insufficient healthy red blood cells remain to adequately oxygenate tissues and organs.

All Forms Are Dangerous

Onion toxicity doesn’t require fresh onions. Toxic compounds persist in:

• Raw onions
• Cooked onions
• Powdered onion (in seasonings)
• Dehydrated onions
• Onion juice or broth

Even foods containing onion powder as a minor ingredient can accumulate to toxic levels if consumed regularly or in large amounts.

Toxic Dose and Accumulation

Research indicates that consumption of approximately 0.5% of a dog’s body weight in onions can produce toxicity. For a 15-pound Shih Tzu, this translates to roughly 1.2 ounces—a relatively small amount.

Importantly, onion toxicity can be cumulative. Repeated small exposures over several days can produce the same effect as a single larger dose, as the toxic compounds build up faster than the body can eliminate them.

Symptoms of Onion Poisoning

Signs may appear within 24 hours but sometimes take several days to manifest:

Early Symptoms:

• Loss of appetite
• Lethargy and weakness
• Reluctance to move or play

Progressive Symptoms:

• Vomiting
• Diarrhea
• Abdominal pain
• Pale or yellowish gums (indicating anemia and possible jaundice)
• Dark red or brown urine (from hemoglobin released by destroyed red blood cells)
• Rapid breathing or panting
• Increased heart rate

Severe Symptoms:

• Collapse
• Severe weakness or inability to stand
• Disorientation

Emergency Response

If onion ingestion is suspected:

1. Contact Your Veterinarian Immediately: Time-sensitive intervention improves outcomes. Don’t wait for symptoms to develop.

2. Provide Information: Report the estimated amount consumed, time of ingestion, and whether the dog shows any symptoms.

3. Do Not Induce Vomiting Without Veterinary Guidance: While inducing vomiting may be appropriate if ingestion occurred recently, this decision should be made by veterinary professionals.

Veterinary Treatment

Treatment approaches may include:

Decontamination: If ingestion occurred recently (within 1-2 hours), veterinarians may induce vomiting or administer activated charcoal to reduce absorption.

Supportive Care: Intravenous fluids help maintain hydration and support kidney function as the body processes and eliminates the toxin.

Monitoring: Blood tests monitor red blood cell counts, hemoglobin levels, and organ function to assess damage severity.

Oxygen Therapy: If anemia becomes severe, supplemental oxygen may be necessary.

Blood Transfusion: In cases of severe hemolytic anemia, blood transfusions may be required to restore adequate red blood cell counts.

Prevention Strategies

• Never feed table scraps containing onions or onion powder
• Keep onions stored securely where dogs cannot access them
• Read ingredient labels on dog foods and treats (some contain onion powder)
• Educate family members and visitors about onion dangers
• Be vigilant about dropped food during meal preparation

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2. Xylitol: The Rapidly Acting Artificial Sweetener

What Is Xylitol?

Xylitol is a sugar alcohol used as an artificial sweetener in numerous products. While safe for human consumption and even beneficial for dental health, xylitol is extremely toxic to dogs.

Why Xylitol Is Dangerous for Dogs

Rapid Insulin Release: When dogs consume xylitol, their pancreas mistakes it for real sugar and releases large amounts of insulin. Unlike in humans, where xylitol doesn’t significantly affect insulin levels, dogs experience massive insulin surges.

Hypoglycemia: The sudden insulin release causes blood glucose levels to plummet rapidly—sometimes within 10-60 minutes of ingestion. Hypoglycemia (dangerously low blood sugar) can cause seizures, loss of consciousness, and death if untreated.

Liver Damage: In addition to causing hypoglycemia, xylitol can cause acute liver failure in dogs. The mechanism isn’t fully understood, but liver damage can occur even when hypoglycemia is successfully managed.

Common Products Containing Xylitol

Xylitol appears in an expanding range of products:

Food Items:

• Sugar-free gum and mints
• Sugar-free candy
• Certain peanut butter brands
• Sugar-free baked goods
• Some ice creams and desserts
• Certain protein bars and powders

Dental and Personal Care:

• Toothpaste (human formulations)
• Mouthwash
• Some medications and vitamins
• Certain cough syrups

Other Products:

• Some nasal sprays
• Certain cosmetics
• Various “sugar-free” labeled products

Always check ingredient labels, as manufacturers increasingly incorporate xylitol into diverse products.

Toxic Dose

Xylitol toxicity dose depends on the effect:

Hypoglycemia: Can occur with doses as low as 0.1 grams per kilogram of body weight. For a 15-pound (6.8 kg) Shih Tzu, this equals approximately 0.68 grams—less than one piece of xylitol-containing gum in many cases.

Liver Damage: Typically requires higher doses (0.5+ grams per kilogram), but individual sensitivity varies.

Given the small size of Shih Tzus, even products containing relatively small amounts of xylitol can deliver toxic doses.

Symptoms of Xylitol Poisoning

Hypoglycemia Symptoms (10 minutes to 12 hours after ingestion):

• Vomiting
• Weakness or lethargy
• Loss of coordination or stumbling
• Trembling or shaking
• Disorientation or confusion
• Seizures
• Collapse or loss of consciousness

Liver Failure Symptoms (12-72 hours after ingestion):

• Lethargy
• Loss of appetite
• Vomiting
• Jaundice (yellowing of gums, whites of eyes, or skin)
• Black, tarry stools
• Bruising or bleeding abnormalities

Emergency Response

Xylitol poisoning requires immediate veterinary intervention:

1. Call Your Veterinarian or Emergency Clinic Immediately: Even if the dog appears normal, xylitol poisoning can progress rapidly. Don’t wait for symptoms.

2. Provide Product Information: If possible, bring the product package or provide ingredient information and estimated amount consumed.

3. Follow Professional Guidance: Veterinarians may instruct you to bring the dog immediately or provide initial first aid instructions.

Veterinary Treatment

Blood Glucose Monitoring: Frequent blood glucose checks determine if hypoglycemia is developing and assess treatment effectiveness.

Dextrose Administration: Intravenous dextrose (sugar) counteracts hypoglycemia and may be continued for 12-24 hours or longer.

Liver Function Monitoring: Blood tests assess liver enzymes and function to detect early signs of liver damage.

Supportive Care: IV fluids, anti-nausea medications, and liver protectants support recovery.

Hospitalization: Dogs typically require hospitalization for monitoring and treatment, sometimes for several days.

Prevention Is Critical

• Read all ingredient labels before sharing any human food
• Store xylitol-containing products securely out of reach
• Use dog-specific peanut butter that doesn’t contain xylitol
• Educate family members about xylitol dangers
• Be especially vigilant about purses, bags, and backpacks that might contain gum or mints

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3. Chocolate: The Well-Known But Still Common Danger

Toxic Compounds in Chocolate

Chocolate contains two methylxanthine compounds toxic to dogs:

Theobromine: The primary toxic agent in chocolate, theobromine is metabolized much more slowly in dogs than humans, allowing it to build to toxic levels.

Caffeine: Present in smaller amounts than theobromine but contributing to overall toxicity.

Dogs lack efficient enzymes to break down these compounds, resulting in prolonged exposure to their toxic effects.

Why Dogs Can’t Process Chocolate Like Humans

Human metabolism processes theobromine relatively quickly, eliminating it before toxic accumulation occurs. Dogs metabolize theobromine approximately 3-4 times slower, allowing dangerous levels to persist in their systems for extended periods—sometimes 17+ hours.

Chocolate Type Matters

Different chocolate types contain varying theobromine concentrations:

Cocoa Powder and Baker’s Chocolate: Highest concentrations (approximately 130-450 mg theobromine per ounce). Very dangerous even in tiny amounts.

Dark Chocolate: High concentrations (approximately 130-150 mg per ounce). Significantly more dangerous than milk chocolate.

Milk Chocolate: Moderate concentrations (approximately 44-60 mg per ounce). Still dangerous, particularly in larger amounts.

White Chocolate: Minimal theobromine (less than 1 mg per ounce). Not typically dangerous for theobromine toxicity, though high fat content can cause other problems.

Toxic Dose Calculations

Toxicity severity depends on amount consumed and chocolate type:

Mild Symptoms: 20 mg theobromine per kilogram of body weight Moderate Symptoms: 40-50 mg/kg Severe Symptoms: 60+ mg/kg

For a 15-pound (6.8 kg) Shih Tzu:

• Mild toxicity: Approximately 136 mg theobromine
• Severe toxicity: Approximately 408+ mg theobromine

This translates to roughly:

• 1 ounce of baker’s chocolate (severe toxicity)
• 3-4 ounces of dark chocolate (severe toxicity)
• 7-9 ounces of milk chocolate (severe toxicity)

However, individual sensitivity varies, and any amount warrants veterinary consultation.

Symptoms of Chocolate Poisoning

Early Symptoms (2-4 hours after ingestion):

• Vomiting
• Diarrhea
• Increased thirst
• Restlessness or hyperactivity
• Excessive urination

Progressive Symptoms:

• Rapid breathing
• Increased heart rate
• Trembling or muscle twitching
• Excessive panting

Severe Symptoms:

• Seizures
• Abnormal heart rhythms (arrhythmias)
• Heart failure
• Collapse
• Death in extreme cases

Emergency Response

If chocolate consumption occurs:

1. Determine Amount and Type: Calculate approximate amount consumed and identify chocolate type.

2. Contact Your Veterinarian: Provide information about chocolate type, estimated amount, time of ingestion, and dog’s weight.

3. Follow Professional Guidance: Veterinarians may recommend immediate clinic visit or monitoring at home depending on amount and type consumed.

4. Online Toxicity Calculators: Pet poison control websites offer chocolate toxicity calculators, but these supplement rather than replace veterinary consultation.

Veterinary Treatment

Decontamination: If ingestion occurred within 2 hours, inducing vomiting may prevent further absorption. Activated charcoal may also be administered.

Cardiac Monitoring: Heart rate and rhythm monitoring detect dangerous arrhythmias requiring treatment.

Seizure Management: Anti-seizure medications control convulsions if they occur.

Supportive Care: IV fluids promote toxin elimination through increased urination and maintain hydration.

Symptom Management: Medications control specific symptoms like vomiting or abnormal heart rhythms.

Prevention Strategies

• Store all chocolate products in cabinets or containers inaccessible to dogs
• Be especially vigilant during holidays (Halloween, Easter, Christmas, Valentine’s Day) when chocolate is more prevalent
• Educate children never to share chocolate with pets
• Dispose of chocolate wrappers securely—even licking wrappers can deliver small doses
• Consider dog-safe carob as an alternative for dog treats (not chocolate)

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4. Grapes and Raisins: The Mystery Toxin Causing Kidney Failure

The Unknown Toxic Mechanism

Despite extensive research, scientists haven’t definitively identified which compound in grapes and raisins causes toxicity in dogs. Various theories have been investigated—tartaric acid, tannins, mycotoxins—but the exact mechanism remains unclear.

What is certain: grapes and raisins can cause acute kidney failure in dogs, and the toxic dose varies unpredictably between individual animals.

Unpredictable Toxicity

One of the most concerning aspects of grape toxicity is its variability:

• Some dogs consume grapes without apparent effects
• Other dogs develop severe kidney failure from tiny amounts
• No reliable way exists to predict which dogs will react or what dose will be toxic

This unpredictability means no “safe” amount exists. Even a single grape or raisin could potentially trigger kidney failure in a sensitive dog.

All Grape Products Are Dangerous

Toxicity applies to:

• Fresh grapes (all varieties)
• Raisins
• Currants
• Grape juice
• Products containing grapes or raisins (trail mix, baked goods, fruit salads)

Both organic and conventionally grown grapes cause toxicity, ruling out pesticides as the responsible agent.

Symptoms of Grape Poisoning

Initial Symptoms (6-12 hours after ingestion):

• Vomiting (often repeatedly)
• Diarrhea
• Loss of appetite
• Lethargy or weakness
• Abdominal pain (hunched posture, reluctance to move)

Progressive Kidney Failure Symptoms (24-72 hours):

• Decreased or absent urine production
• Dehydration despite fluid intake
• Increased drinking (initially) followed by decreased drinking
• Severe lethargy
• Bad breath with chemical odor
• Oral ulcers
• Trembling or seizures (advanced stages)

Why Kidney Failure Is Life-Threatening

Kidneys filter waste products from blood and regulate fluid and electrolyte balance. Acute kidney failure means these functions shut down rapidly:

• Toxic waste products accumulate in the bloodstream
• Electrolyte imbalances develop (particularly dangerous potassium elevation)
• Acid-base balance disrupts
• Multiple organ systems are affected by the toxic internal environment

Without aggressive treatment, kidney failure progresses to death.

Emergency Response

Any grape or raisin ingestion warrants immediate veterinary contact:

1. Call Your Veterinarian Immediately: Don’t wait to see if symptoms develop. Early intervention significantly improves outcomes.

2. Report Amount Consumed: Even uncertainty about exact amount requires veterinary evaluation.

3. Bring the Dog In: Most veterinarians recommend immediate examination after grape ingestion rather than home monitoring.

Veterinary Treatment

Decontamination: If ingestion occurred recently, induced vomiting removes unabsorbed grapes. Activated charcoal may limit absorption.

Aggressive Fluid Therapy: Intravenous fluids for 48-72 hours help flush kidneys, promote urine production, and prevent or minimize kidney damage. This represents the most critical treatment component.

Kidney Function Monitoring: Blood tests (BUN, creatinine) and urine tests monitor kidney function to detect early failure and assess treatment effectiveness.

Hospitalization: Dogs typically require hospitalization for fluid therapy and monitoring, often for 2-3 days minimum.

Long-term Monitoring: Even with successful initial treatment, some dogs develop chronic kidney disease requiring ongoing management.

Prevention Is Essential

• Never feed grapes or raisins as treats
• Keep fruit bowls out of reach (especially important with counter-surfing dogs)
• Educate children and visitors never to share these foods
• Check ingredients in trail mixes, granola bars, and baked goods before any accidental access
• Be vigilant about dropped grapes during food preparation
• Secure trash bins containing grape stems or raisin boxes

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5. Avocado: The Multi-Component Toxicity Risk

Persin: The Primary Toxic Compound

Avocados contain persin, a fungicidal toxin present in the fruit, pit, leaves, and bark of avocado plants. While humans consume avocados safely, dogs are more sensitive to persin’s effects.

Toxicity Variability

Persin toxicity in dogs appears less severe and consistent than in some other animals (birds and livestock experience more severe effects). Most dogs experiencing avocado ingestion develop gastrointestinal symptoms rather than life-threatening toxicity.

However, sensitivity varies between individual dogs, and large amounts can produce more serious effects.

Multiple Hazard Components

Persin Content: The fruit flesh contains persin, potentially causing digestive upset and, in larger amounts, more serious effects.

High Fat Content: Avocados contain approximately 15-30% fat. This high fat concentration can trigger pancreatitis (pancreatic inflammation)—a serious, painful condition requiring veterinary treatment.

Choking Hazard: The large, round pit presents a choking risk if swallowed whole, particularly for smaller dogs.

Intestinal Obstruction: If swallowed, the pit can lodge in the stomach or intestines, causing obstruction requiring surgical removal.

Skin and Leaves: The skin and leaves of avocado plants contain higher persin concentrations than the flesh and pose greater toxicity risk.

Symptoms of Avocado Ingestion

Gastrointestinal Symptoms:

• Vomiting
• Diarrhea
• Abdominal discomfort
• Loss of appetite
• Gas and bloating

Pancreatitis Symptoms (if high-fat content triggers inflammation):

• Severe vomiting
• Diarrhea (sometimes bloody)
• Abdominal pain (hunched posture, reluctance to move)
• Lethargy
• Fever
• Loss of appetite

Obstruction Symptoms (if pit is swallowed):

• Repeated vomiting
• Complete loss of appetite
• Abdominal pain
• Inability to defecate
• Lethargy and weakness

Risk Assessment by Amount

Small Amount of Flesh: May cause mild digestive upset or potentially no symptoms. Monitoring at home may be appropriate with veterinary telephone consultation.

Large Amount of Flesh: Greater risk of significant gastrointestinal distress and potential pancreatitis. Veterinary evaluation recommended.

Pit Swallowed: Immediate veterinary attention required for choking assessment and possible obstruction prevention.

Skin or Leaves: Higher persin concentrations warrant veterinary consultation.

Emergency Response

1. Assess What Was Consumed: Determine whether only flesh was eaten or if pit, skin, or leaves were involved.

2. Contact Your Veterinarian: Describe amount and components consumed. Veterinarians will assess risk level and recommend appropriate action.

3. Watch for Symptoms: Monitor for vomiting, diarrhea, and behavioral changes. Report symptom development to your veterinarian.

Veterinary Treatment

Gastrointestinal Symptoms: May be managed with anti-nausea medications, gastrointestinal protectants, and bland diet.

Pancreatitis: Requires hospitalization with IV fluids, pain management, anti-nausea medications, and fasting followed by gradual diet reintroduction.

Obstruction: May require endoscopic removal or surgical intervention depending on pit location and size.

Prevention Strategies

• Never intentionally feed avocado to dogs
• Keep avocados stored securely on counters or in refrigerators inaccessible to dogs
• Dispose of pits, skins, and leaves in secure trash bins
• If you grow avocado plants, prevent dog access to all parts
• Educate household members about avocado risks
• Be vigilant about dropped pieces during food preparation

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Creating a Pet-Safe Kitchen Environment

General Safety Principles

Secure Storage: Keep all potentially toxic foods in cabinets, pantries, or refrigerators that dogs cannot access. Avoid leaving foods on low tables or counters within reach.

Immediate Cleanup: Clean up spills and dropped food immediately during food preparation.

Trash Security: Use trash bins with secure lids or store trash in cabinets. Dogs often investigate garbage for food scraps.

Guest Education: Inform visitors about which foods are dangerous for dogs and request they don’t feed table scraps. Learn more about common household hazards beyond food.

Child Supervision: Young children may not understand food dangers and should be supervised around pets during meals or snacks.

Emergency Preparedness

Poison Control Information: Keep contact information readily available:

• Your regular veterinarian
• Nearest 24-hour emergency veterinary clinic
• ASPCA Animal Poison Control Center: (888) 426-4435
• Pet Poison Helpline: (855) 764-7661

First Aid Knowledge: Understand basic first aid, though never attempt home treatment without professional guidance for poisoning cases.

Medical Records: Maintain current records of your Shih Tzu’s weight, medications, and health conditions to provide to emergency veterinarians.

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What to Do If Toxic Food Ingestion Occurs

Immediate Steps

1. Stay Calm: Panic impairs effective response. Remaining calm allows clear thinking and communication.

2. Remove Access: Prevent further consumption by removing the food source and separating the dog from the area.

3. Assess the Situation:

   • What was consumed?
   • Approximately how much?
   • When did ingestion occur?
   • Does the dog show any symptoms?

4. Contact Your Veterinarian: Call immediately rather than waiting to see if symptoms develop. For after-hours situations, call emergency veterinary services.

5. Follow Professional Guidance: Veterinarians will advise whether immediate clinic visit is necessary or if home monitoring is appropriate.

6. Do Not Attempt Home Remedies: Never induce vomiting, administer medications, or try other interventions without specific veterinary instruction.

Information to Provide Veterinarians

• Dog’s weight
• Substance consumed (bring packaging if possible)
• Estimated amount consumed
• Time of ingestion
• Any symptoms observed
• Any pre-existing health conditions
• Current medications

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The Importance of Prevention

While emergency treatment can be life-saving, prevention remains the most effective approach to protecting Shih Tzus from food toxicity. The combination of toxic food knowledge, secure food storage, household education, and vigilant supervision creates multiple protective layers.

Small dogs like Shih Tzus face particular vulnerability due to their size—small amounts of toxic substances produce more severe effects than in larger dogs. This vulnerability makes prevention even more critical.

Watch the full video above for additional information about protecting your Shih Tzu from toxic foods.

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Educating Everyone in the Household

All family members and regular visitors should understand:

• Which foods are dangerous for dogs
• Why sharing human food can be harmful
• The importance of secure food storage
• What to do if accidental ingestion occurs

Children particularly need age-appropriate education, as they may not naturally understand that foods safe for them can harm pets.

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Conclusion

The five toxic foods discussed—onions, xylitol, chocolate, grapes, and avocados—represent common household items that pose serious health risks to Shih Tzus. Understanding why these foods are dangerous, recognizing symptoms of toxicity, and knowing appropriate emergency responses can be life-saving.

Prevention through secure storage, careful food handling, and household education provides the best protection. When prevention fails, immediate veterinary intervention offers the best chance for positive outcomes.

Shih Tzu owners who remain informed about food dangers and maintain vigilant prevention practices protect their companions from preventable suffering and potentially life-threatening emergencies. The small investment of time in learning about toxic foods and implementing protective measures returns immeasurable value in safeguarding canine health and wellbeing.

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📚 Related Guides You’ll Find Helpful

Household Hazards

• 10 Dangerous Household Items That Could Kill Your Shih Tzu - Non-food dangers in your home
• Shih Tzu Mistakes Every Owner Makes - Fatal feeding and safety errors

Health & Warning Signs

• Signs Your Shih Tzu Is Sick, in Pain, or Uncomfortable - Recognize poisoning symptoms and detect hidden distress

Proper Care

• Complete Shih Tzu Care Guide - Safe nutrition and emergency protocols

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This guide is for educational purposes only. Every dog is different, and toxic reactions can vary. Always consult with a licensed veterinarian immediately if you suspect your Shih Tzu has consumed any potentially toxic substance. Quick professional intervention significantly improves treatment outcomes.