Unlike humans, animals such as dogs and cats are highly susceptible to chocolate toxicity. Their bodies process theobromine much more slowly, allowing it to accumulate to toxic levels. Symptoms of toxicity in pets include vomiting, diarrhea, rapid breathing, increased heart rate, and seizures. Without prompt veterinary intervention, it can be fatal. It's crucial to keep chocolate out of reach of pets and to be aware of the signs of chocolate toxicity in case of accidental ingestion.