If the dog just eats a little bit of chocolate, it may not be too much of a problem under normal circumstances. The theobromine and methylxanthines contained in chocolate are harmful to dogs, but small amounts may cause only mild symptoms such as stomach upset, vomiting, or diarrhea. However, it also depends on the concentration of chocolate and the weight of the dog.
For small pieces of chocolate that are not of high concentration, most of the time the dog may be able to recover on its own, but it is still recommended to closely observe the dog's symptoms. If you experience symptoms such as vomiting, diarrhea, prolonged thirst, or rapid heartbeat, you should see a doctor immediately.
And if the dog ingests a high concentration of chocolate (such as dark chocolate), even if the amount is small, it is recommended to take the dog to the veterinarian as soon as possible, because the high concentration of chocolate contains more harmful ingredients and may pose a greater threat to the dog's health.
Overall, while a small amount of chocolate may not cause serious harm to your dog, it is best to avoid exposing your dog to chocolate for the sake of his dog's health. In the unfortunate event of accidental ingestion, the dog should be closely monitored for symptoms and seek help from a veterinarian if necessary.