Chocolate is highly toxic to dogs due to the presence of theobromine and caffeine, both of which can be harmful. The toxicity level depends on the type of chocolate and the size of the dog. Generally, the darker the chocolate, the more toxic it is. Here are some guidelines:

1. **Types of Chocolate**:
- **Baker's Chocolate**: Contains the highest level of theobromine. Even small amounts can be lethal.
- **Dark Chocolate**: Contains a significant amount of theobromine. A small piece can cause symptoms.
- **Milk Chocolate**: Less toxic than dark chocolate, but still dangerous. It takes about 1 ounce of milk chocolate per pound of body weight to be potentially toxic.
- **White Chocolate**: Contains very low levels of theobromine and is considered less harmful, but it's still not recommended.

2. **Toxicity Levels**:
- The general rule of thumb is that 0.5 ounces of dark chocolate per pound of body weight can be toxic, while 1 ounce of milk chocolate per pound can also cause issues.

3. **Symptoms of Chocolate Poisoning**:
- Vomiting
- Diarrhea
- Rapid breathing
- Increased heart rate
- Seizures
- In severe cases, it can lead to death.

4. **What to Do if Your Dog Eats Chocolate**:
- **Act Quickly**: If you suspect your dog has eaten chocolate, contact your veterinarian immediately.
- **Provide Information**: Be ready to provide details about the type of chocolate and the amount consumed.
- **Induce Vomiting**: Your vet may recommend inducing vomiting if the ingestion was recent.

Always keep chocolate out of reach of your dog, and educate family and friends about the dangers of feeding chocolate to pets. It's better to be safe than sorry when it comes to your furry friend's health!

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Topics covered in this question:

Dog Health Pet Safety Chocolate Toxicity