Call ASPCA Poison Control: (888) 426-4435 or go to your nearest emergency vet. Do not wait for symptoms to appear.
Caffeine is a methylxanthine compound toxic to dogs, related to theobromine found in chocolate. Dogs metabolise caffeine much more slowly than humans — what feels like a mild stimulant to a person can cause seizures, cardiac arrhythmias, and death in a dog. Sources include coffee, espresso, tea, energy drinks, caffeine tablets, pre-workout supplements, and some medications.
Shih Tzus are brachycephalic — their flat facial structure restricts airflow and makes respiratory compromise from vomiting or toxic exposure more dangerous than in longer-nosed breeds. They are curious and bold for their size, often accessing food left unattended. Their kidney function can also be more sensitive than many breeds, making renal-toxic substances especially dangerous.
Why Does Breed Matter for Caffeine Toxicity?
Toxic doses for caffeine are calculated per kilogram of body weight. A Shih Tzu typically weighs 4–7.5 kg, which directly determines how much caffeine (methylxanthine) their body is exposed to relative to their size. Beyond weight, Shih Tzus have specific traits — outlined in the breed profile above — that can affect how quickly symptoms develop, how severe they become, and what complications to watch for.
When you call Poison Control, always give your dog's exact current weight, not a breed average. Even within the Shih Tzu breed, a significant weight difference changes the risk calculation meaningfully.
How Much Caffeine Is Toxic to a Shih Tzu?
These thresholds are based on the typical Shih Tzu weight range of 4–7.5 kg. Always use your dog's actual weight for the most accurate estimate. Use our Caffeine Toxicity calculator to enter your dog's exact weight.
| Dog weight | Mild signs | Serious signs | Potentially fatal |
|---|---|---|---|
| 4 kg (small Shih Tzu) | 60 mg of caffeine | 160 mg of caffeine | 600 mg of caffeine |
| 5.5 kg (average Shih Tzu) | 82 mg of caffeine | 220 mg of caffeine | 825 mg of caffeine |
| 7.5 kg (large Shih Tzu) | 112 mg of caffeine | 300 mg of caffeine | 1.1 g of caffeine |
ℹ️ Mild signs at ~15mg/kg; serious at 40mg/kg; potentially fatal at 150mg/kg+. A standard espresso contains ~63mg caffeine — enough to cause symptoms in a 4kg dog. Source: ASPCA Animal Poison Control Center dose thresholds. Always confirm with your vet.
Symptoms of Caffeine Poisoning in Shih Tzus
Symptoms typically appear within 1–2 hours of ingestion. Watch for:
Due to Shih Tzu-specific traits noted above, pay particular attention to any signs of breathing difficulty — their flat faces mean respiratory compromise can escalate rapidly compared to other breeds.
What to Do If Your Shih Tzu Ate Caffeine
- Stay calm and note how much they ate — estimate the amount and type of caffeine and your dog's weight. This information is critical for the vet.
- Call ASPCA Poison Control immediately — (888) 426-4435. Available 24/7. A $95 consultation fee may apply, but they will advise whether you need emergency care.
- Do not induce vomiting unless specifically instructed by a vet or Poison Control. Inducing vomiting incorrectly can cause additional harm.
- Go to an emergency vet if symptoms are already present, if a large amount was consumed, or if Poison Control advises it. Find a 24-hour emergency vet near you.
- Bring the packaging of the food or substance if possible — ingredient lists help the vet calculate exact toxin exposure.
Special Considerations for Shih Tzus
Like all brachycephalic breeds, Shih Tzus have increased aspiration risk during vomiting. Vets may use different decontamination protocols than they would for non-brachycephalic dogs. Their documented kidney sensitivity also means that renal-toxic substances (like grapes or certain NSAIDs) warrant aggressive fluid support and close monitoring of kidney values.
Frequently Asked Questions
Tea contains less caffeine than coffee but is still toxic. Green tea and black tea both contain caffeine, and some herbal teas contain other stimulants. All should be kept away from dogs.
A small lick from a small spill is unlikely to cause serious harm in a large dog. However, in small dogs, even a few laps of brewed coffee can approach concerning levels. Call Poison Control to assess the specific risk.
Very much so — energy drinks contain high caffeine concentrations combined with other stimulants. They are among the most dangerous caffeine sources for dogs.
Treatment involves inducing vomiting if recent ingestion, IV fluids, medications to control heart rate and prevent seizures, and monitoring. Most dogs recover with prompt treatment.