Final answer:
When a pet has a history of vaccine reactions, consulting with a veterinarian is crucial before any further vaccinations to ensure the pet's safety and compliance with legal requirements.
Step-by-step explanation:
If a pet parent indicates their pet has had a previous reaction to vaccines, the most appropriate course of action would be to consult with a veterinarian before administering any vaccines. It is essential for a vet to assess the risk and provide a safe vaccination plan which may include pre-medication, a modified vaccine schedule, or the use of different vaccine brands. Proceeding without consultation could put the pet at risk of another adverse reaction. Administering a lower dose is not generally advised without professional guidance, as it may not provide the necessary immune protection and can still trigger adverse reactions in sensitive animals. Furthermore, rabies vaccinations might be legally required depending on the area, highlighting the necessity of professional involvement in these decisions. Therefore, the correct answer to the student's question is that you should consult with a veterinarian.