It is toxic to dogs,, but i think they have to consume a fair amount for it to be a problem.
Quote:
Chocolate, Tea, Coffee, and Coffee Beans
Their content of caffeine, theophylline, or theobromine affects the nervous system and the heart of dogs. Chocolate overdose symptoms may include, excessive panting, hyperactivity, vomiting, diarrhea, irregular heartbeat, and death.
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Might be worth calling your vet tbh.