What Food Is Not Allowed for Shih Tzu Dogs?

What foods are toxic to Shih Tzu?

Chocolate and caffeine, grapes and raisins, xylitol, onions and garlic, macadamia nuts, alcohol, and raw yeast dough are among the foods and ingredients that can poison dogs. The risk depends on the specific food, amount, and dog; a Shih Tzu’s small size makes it especially important not to treat a bite or lick as automatically harmless.

Chocolate illustrates why the type of food matters. The Merck Veterinary Manual reports that cocoa powder contains about 28.5 mg/g of methylxanthines, compared with 15.5 mg/g in baker’s chocolate, 5.3–5.6 mg/g in dark chocolate, and 2.3 mg/g in milk chocolate. In dogs, mild signs may occur at 20 mg/kg, cardiac effects at 40–50 mg/kg, and seizures at 60 mg/kg or more. These are risk indicators, not a home safety calculator: individual susceptibility and product concentrations vary.

Other hazards act differently. The ASPCA Animal Poison Control Center says grapes and raisins can cause kidney damage, and the risk cannot be reliably judged from the food name alone. Macadamia nuts can cause weakness, incoordination, vomiting, tremors, and elevated body temperature; signs usually appear within 12 hours. Alcohol can cause effects ranging from vomiting and poor coordination to breathing difficulty, coma, or death. Raw yeast dough can expand in the stomach and produce alcohol.

Use a label-and-access check, not guesswork. Store these foods and products where a curious dog cannot reach them, and check ingredient lists on packaged items. For other diet questions, see this guide to choosing dog food for itchy skin.

Can a small amount of chocolate hurt a Shih Tzu?

Yes, a small amount can be dangerous depending on the chocolate, the dog’s weight, and the amount eaten. “Small” describes the portion to a person; it does not establish a safe dose for a small dog.

Merck says chocolate’s theobromine and caffeine are the relevant methylxanthines, and concentrations vary substantially by product. Signs commonly appear 6–12 hours after ingestion and can include vomiting, restlessness, abnormal heart rhythm, tremors, and seizures. High-fat chocolate can also contribute to pancreatitis.

Do not wait for symptoms to decide whether to call. Keep the packaging if available, estimate the amount and time, and give those details plus your Shih Tzu’s weight to a veterinarian. The delay before signs appear means a dog that seems normal right after eating chocolate may still need prompt professional advice.

Are grapes, raisins, onions, or garlic dangerous for Shih Tzus?

Yes. Grapes and raisins can damage dogs’ kidneys, while onions and garlic can injure red blood cells; there is no reliable way to clear a suspected exposure based only on a small-looking amount.

The ASPCA identifies tartaric acid as a suspected toxic component in grapes and raisins, but says risk cannot be reliably determined from the food name alone. Treat ingestion as a reason to contact a veterinarian rather than waiting to see whether your dog becomes ill.

Onions and garlic are hazardous raw, cooked, dehydrated, or granulated. Merck notes that garlic is 3–5 times more toxic than onion, and concentrated forms such as flakes, powders, and dry onion soup mixes are commonly associated with toxicosis. They can cause oxidative damage to red blood cells and hemolytic anemia. Signs may take several days to appear and include weakness, pale or yellow gums, rapid breathing, dark urine, and collapse; hemolysis typically occurs 3–5 days after exposure.

That delay changes the response: a normal-looking dog is not proof that the exposure was harmless. Check sauces, seasoning mixes, and prepared foods for onion or garlic ingredients, and report the exact product to a veterinarian. Merck reports clinical signs after dogs ingested 15–30 g/kg of raw onion, but explicitly relevant exposure thresholds should not be used as a safe-dose guide for an individual dog.

Which sugar-free foods or products contain xylitol?

Xylitol can appear in sugar-free gum, candy, mints, peanut butter, baked goods, toothpaste, mouthwash, chewable vitamins, supplements, and some liquid medicines. Check the ingredient list rather than relying on the product’s front label.

According to Merck, doses above approximately 100 mg/kg have been associated with low blood sugar, while doses above 500 mg/kg may cause severe liver failure in some dogs. Low blood sugar signs can begin within 30 minutes or be delayed up to 12–18 hours. Vomiting, weakness, lethargy, seizures, and coma are possible; signs of liver injury may not appear for 24–48 hours.

For a Shih Tzu, product name, ingredient list, estimated amount, and body weight give the veterinary team useful information quickly. If xylitol is listed or the ingredients are unclear, call promptly rather than waiting for symptoms. The package is more useful than a guess about how much sweetener a piece contained.