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It happens fast. You turn around and the Easter box is open and the dog is guilty in a way only a dog can be. Chocolate is a real toxin for dogs, but the danger depends on three things: the type, the amount, and the size of the dog.
Dark and baking chocolate carry far more theobromine than milk chocolate, so a small dog that eats a square of dark is in more trouble than a large dog that licks a dropped milk-chocolate button. Size matters as much as the candy does.
Do not wait to see if the dog looks fine. Call your vet or an animal poison line with the type, the estimated amount, and your dog's weight. They will tell you whether to watch, to bring the dog in, or to induce vomiting, which only a professional should direct.
Do not try home remedies you read about. Salt, oil, and internet tonics cause their own damage. The clock matters more than your kitchen cabinet.
Restlessness, a racing heart, vomiting, tremors, and seizures mean the toxin is winning and the dog needs emergency care now. Even without those signs, the vet may want to give charcoal or fluids to blunt the dose.
The boring prevention is the real fix. Keep chocolate where a counter-surfing dog cannot reach, teach a solid leave-it, and remind guests that a dog begging at the table is not a reason to share. Most chocolate emergencies are just an unlocked cupboard away.