Why 100g crosses the danger line
For most dogs, 100g of milk chocolate equals roughly 20–30mg of theobromine per pound of body weight—enough to trigger toxicity. Smaller breeds may hit this threshold with just half that amount. The sugar and fat content can also cause pancreatitis, compounding the risk.
Dark chocolate at this quantity is far worse, potentially delivering over 100mg of theobromine per pound. That’s why vets need details immediately—they’ll compare your dog’s weight against the chocolate type to gauge whether hospitalization is needed.
The difference between nibbling and gulping
A dog that slowly ate the bar over an hour absorbs less theobromine than one that swallowed it whole. Rapid ingestion means higher peak toxin levels. Tell your vet if you saw chewing versus gulping—it helps them predict symptom onset timing.
Check for foil or wrapper remnants in your dog’s mouth. Ingested packaging can cause intestinal blockages, which complicate chocolate toxicity. Foil may show up on X-rays if your dog starts vomiting repeatedly or refuses food later.
What to expect at the vet’s office
Clinics often start with subcutaneous fluids for mild cases, switching to IV drips if heart arrhythmias develop. They’ll monitor your dog’s temperature—theobromine can cause dangerous overheating. Blood work focuses on liver enzymes and electrolyte balance.
Don’t be surprised if they keep your dog for 12–24 hours. Chocolate toxicity rarely resolves on its own, and symptoms like diarrhea may appear late. Ask about follow-up checks if your dog has a history of sensitive digestion.
Long-term risks you might overlook
Repeated chocolate exposure, even in small amounts, can strain a dog’s kidneys over time. This incident is a chance to dog-proof your snack storage—many dogs seek chocolate again after their first taste. Keep all cocoa products in sealed cabinets, not purses or low tables.
If your dog recovered without treatment this time, don’t assume future incidents will be the same. Age and health changes alter toxin tolerance. Book a wellness check to discuss prevention strategies tailored to your dog’s habits.
The full verdict, portion guidance and serving notes are collected on the Chocolate food facts page.