The frequency of dog vaccinations depends on several factors, including your dog's age, breed, lifestyle, and overall health. Generally, core vaccines, such as rabies, distemper, and parvovirus, are recommended every three years, while non-core vaccines, such as Lyme disease and bordetella, may be required more frequently depending on your dog's risk factors. It's best to consult with your veterinarian to determine the appropriate vaccination schedule for your dog.