**Core Concept**
The child has been previously immunized with a full course of Rabies vaccine, but now presents with a potential exposure to rabies due to a dog bite. This situation requires immediate attention to assess the risk of rabies transmission and determine the need for post-exposure prophylaxis (PEP).

**Why the Correct Answer is Right**
The correct course of action is to administer a booster dose of Rabies vaccine, as the child has already been immunized previously. This booster dose will help maintain adequate immunity against rabies. The World Health Organization (WHO) recommends a booster dose of Rabies vaccine in individuals who have been previously immunized and are at risk of exposure. This is because the immunity from the previous vaccination may wane over time.

**Why Each Wrong Option is Incorrect**
* **Option A:** Administering a full course of Rabies vaccine again would be unnecessary and potentially wasteful, as the child has already received a full course of vaccination last year.
* **Option B:** Not providing any further immunization would leave the child vulnerable to rabies infection, despite the potential risk of exposure.
* **Option C:** Using a different type of vaccine, such as MMR or Hepatitis A, would not provide protection against rabies and would be an inappropriate choice in this situation.

**Clinical Pearl / High-Yield Fact**
In cases of potential rabies exposure, it is essential to assess the risk of transmission and provide prompt post-exposure prophylaxis, including a booster dose of Rabies vaccine if the individual has been previously immunized.

**Correct Answer:** C.