What is the difference between core and non-core vaccines?
Core vaccines protect against diseases that pose universal risk to all pets and are recommended by AAHA and AVMA standards; non-core vaccines target threats specific to a pet's lifestyle, geography, or risk factors.
The American Animal Hospital Association (AAHA) and American Veterinary Medical Association (AVMA) classify pet vaccines into two categories based on disease risk and recommendation levels.
Core vaccines are considered medically necessary for all dogs or cats, regardless of lifestyle or location. For dogs, these include protection against rabies, distemper (DHPP), and parvovirus. For cats, core vaccines cover rabies, feline distemper, and feline viral rhinotracheitis-calicivirus (FVRCP). These vaccines target pathogens that pose significant health threats across most or all geographic areas and are often required by law, boarding facilities, or adoption agencies.
Non-core vaccines are optional and recommended based on an individual pet's risk profile. For dogs, this may include vaccines for Bordetella (kennel cough), Leptospirosis, or Lyme disease, depending on the pet's exposure to other animals, outdoor activities, or regional disease prevalence in Colorado. For cats, feline leukemia (FeLV) and feline immunodeficiency virus (FIV) are typically considered non-core except for outdoor or high-risk cats.
Your veterinarian evaluates your pet's age, health history, lifestyle, and Denver-area disease patterns to determine which non-core vaccines make sense. This distinction helps ensure pets receive necessary protection without unnecessary vaccination while keeping medical decisions aligned with current veterinary standards.