Chocolate can cause a number of issues when consumed by dogs. These include diarrhea, vomiting, tremors and hyperactivity. According to WebMD, dogs can also experience high blood pressure and rapid heart rate after consuming chocolate.

Chocolate consumption can also cause life-threatening issues in dogs. For example, large quantities of chocolate can cause seizures, respiratory failure and cardiac arrest in dogs. In severe cases, chocolate can kill dogs. If a dog ingests chocolate, a veterinarian should be contacted immediately. While ingesting a small amount of chocolate may only cause mild stomach discomfort in dogs, ingesting a large amount may require medical help.