Chocolate contains theobromine and caffeine. Cats are actually more sensitive to theobromine than dogs on a mg/kg basis, though they're less likely to eat large amounts. Any ingestion warrants a vet call.
Why Is This Toxic to Cats?
Cats lack the taste receptors for sweetness, so they rarely seek out chocolate. But curious cats may investigate and nibble — and even a small amount of dark or baking chocolate contains enough theobromine to cause toxicity.
Unlike dogs, cats have limited ability to metabolize theobromine through glucuronidation. This makes their toxic threshold potentially lower than dogs'.
| Chocolate Type | Theobromine/oz | Risk for 8 lb Cat | Risk Level |
|---|---|---|---|
| Baking Chocolate | ~390mg | < 0.3oz | EXTREME |
| Dark Chocolate 70%+ | ~150mg | < 0.75oz | HIGH |
| Milk Chocolate | ~60mg | ~2oz | MEDIUM |
| White Chocolate | <1mg | Very large amounts | LOW |
Symptoms & Timeline
Early Signs
Vomiting, hyperactivity, restlessness. Act immediately.
Worsening
Muscle tremors, increased urination, rapid heart rate.
Severe Stage
Arrhythmias, seizures. Hospitalization required.
Recovery/Crisis
With treatment: recovery likely. Without: potentially fatal.
🚨 What To Do Right Now
Theobromine lingers in a cat's system for hours. Don't wait to see if symptoms develop.
Frequently Asked Questions
The toxic dose for theobromine in cats is approximately 200mg/kg. For an 8 lb (3.6 kg) cat, just 0.5oz of dark chocolate could cause symptoms.
Yes, always. Even small amounts can affect cats differently depending on health status. Don't wait for symptoms.
Cats are more sensitive on a mg/kg basis but rarely eat as much as dogs due to lacking sweet taste receptors.
Vomiting, restlessness, rapid breathing, and muscle tremors are common early signs within 6–12 hours.
Most recover fully with prompt treatment. The key is acting before severe symptoms develop.