Why dark chocolate hits harder for a medium-sized dog
Your 12 kg dog just consumed a concentrated dose of theobromine—dark chocolate contains roughly five times more than milk chocolate. Half a standard bar (around 50g) pushes a dog this size into the danger zone for toxicity. Unlike humans, dogs metabolize theobromine slowly, so symptoms can build over hours.
Watch for early signs like pacing or panting—these signal theobromine stimulating their nervous system. At this dose, their heart rate may spike within two hours. Severe cases progress to muscle tremors, but you have a critical window to act before that stage.
How timing changes the risk for a 12 kg body
If it’s been under an hour since ingestion, your vet may still prevent full absorption. After two hours, theobromine enters the bloodstream, shifting priorities to managing symptoms. Smaller dogs process toxins slower—what a large breed might shrug off could overwhelm your dog’s system.
Don’t wait for visible distress; at this dose, internal effects like elevated blood pressure start silently. Time matters less if they’re already drooling or restless—those are red flags demanding immediate care.
Why the next six hours demand close watching
Theobromine’s effects peak around four hours post-ingestion but can linger for 24 hours. Your dog’s size means their body will struggle to clear the toxin efficiently. Even if they seem fine initially, delayed symptoms like arrhythmias can appear suddenly.
Keep them in a quiet, dim space—overstimulation worsens neurological symptoms. Note any vomiting (the body’s attempt to expel toxin), but never induce it yourself. Hydration helps, but only a vet can administer fluids safely if kidneys become stressed.
What makes dark chocolate different from other threats
Unlike grapes or xylitol, chocolate toxicity is dose-dependent—your dog’s weight and the cocoa percentage dictate the danger. Half a milk chocolate bar might only cause diarrhea, but dark chocolate’s potency turns the same quantity into an emergency.
Baking chocolate is worse, but don’t downplay dark—it often contains 70-85% cocoa solids. The sugar and fat in candy bars don’t dilute theobromine enough to protect a 12 kg dog from this amount.
For a dose worked out against your pet's weight, use the Chocolate Toxicity Calculator.