Chocolate can be dangerous to dogs, and the risk depends on the type of chocolate and the dog's weight. In general, darker chocolate and baking chocolate are far more toxic than milk or white chocolate, and smaller dogs are at higher risk. If a dog ingests any amount of chocolate or you’re unsure of the type, contact a veterinarian or an emergency animal hospital immediately. Key points to guide you:

• Theobromine and caffeine are the responsible compounds in chocolate. Darker chocolate contains more theobromine than milk chocolate, and white chocolate contains very little.
• Toxic effects can include restlessness, vomiting, diarrhea, rapid breathing, increased heart rate, tremors, seizures, and in severe cases, death. Early symptoms can appear within a few hours of ingestion.
• Even small amounts can be dangerous for small dogs, while larger dogs may tolerate more, but there is no safe universal quantity. A professional assessment is essential.

What to do if your dog may have eaten chocolate:

• Do not wait for symptoms to appear. Call your veterinarian or an animal poison control hotline right away for guidance tailored to your dog's weight, the type of chocolate, and the amount reported.
• If advised by a professional, you may be asked to monitor the dog at home or to bring them in for treatment. Do not induce vomiting unless instructed by a veterinarian, as some methods can be unsafe.

If you want, you can share:

• The approximate weight of your dog
• The type of chocolate ingested (dark, semisweet, milk, baking, white)
• The approximate amount ingested and when it occurred
  I can then help estimate the level of risk and the urgency of veterinary care, and outline the steps to take while seeking professional advice.