When must vaccinations for pets typically be updated?

Vaccinations for pets are typically updated annually or every three years, depending on the specific vaccine and the pet's health status. Core vaccines, such as those for rabies, distemper, and parvovirus, are usually given according to a schedule that may start when the pet is a young animal and then followed up with booster shots either annually or every three years. Non-core vaccines may vary in frequency based on the risk factors of the pet and the veterinarian's recommendations.

This approach ensures that pets maintain robust immunity to protect against contagious diseases while also considering the potential for adverse reactions from over-vaccination. Pet owners should consult their veterinarians to establish a proper vaccination schedule tailored to their pet's needs, health, and lifestyle. Other options presented in the question do not align with standard veterinary practices regarding vaccination schedules.