### Step-by-Step Solution:
1. **Identify the Question**: The question asks which virus is carried by dogs.
2. **List the Options**: The options provided are:
- Option 1: Rabies
- Option 2: Robos
- Option 3: Plague
- Option 4: Dengue
3. **Analyze Each Option**:
- **Rabies**: This is a well-known virus that affects dogs and can be transmitted to humans through bites.
- **Robos**: This is not a recognized virus associated with dogs.
- **Plague**: This disease is primarily spread by fleas and is not directly associated with dogs.
- **Dengue**: This is a viral infection transmitted by mosquitoes, not dogs.
4. **Determine the Correct Answer**: Based on the analysis, the only virus that is known to be carried by dogs is **Rabies**.
5. **Explain Why Rabies is the Correct Answer**: Rabies is a deadly virus that is transmitted through the saliva of infected dogs, particularly when they bite. Symptoms in humans can include fever, headache, excess salivation, muscle spasms, paralysis, and mental confusion.
6. **Conclude the Answer**: Therefore, the correct answer to the question "Which virus is carried by the dogs?" is **Rabies**.
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