Even small amounts are hazardous, as chocolate is toxic to dogs at just one ounce per pound of body weight. Look out for symptoms of chocolate ingestion. These include increased water consumption, vomiting, diarrhea, elevated heart rate, panting, and increased or excessive urination.
Learn what to do if your dog ate chocolate. Understand toxicity risks, symptoms, and emergency steps, plus how vets treat chocolate poisoning in dogs.
What symptoms of chocolate poisoning should I watch for? Common signs include vomiting, diarrhea, restlessness, rapid breathing, increased heart rate, and tremors.

Dogs may also be at risk for developing gastrointestinal distress or even pancreatitis because many chocolate products are high in fat and sugar. The amount of theobromine and caffeine in a chocolate product varies, but generally, the darker the chocolate, the higher the risk to dogs.
If your dog ate a large amount of dark chocolate, or you are unsure, contact your veterinarian or an emergency clinic immediately. You can also use an online chocolate toxicity calculator to estimate risk.

Common indicators include vomiting and diarrhea, which can lead to dehydration if left untreated. Your dog may also exhibit restlessness or anxiety, such as pacing back and forth or whining excessively.