PetMD
https://www.petmd.com/dog/general-health/what-titer-test-and-it-right-your-pet-0
“What I suggest for puppies and kittens is to vaccinate according to state law, which is typically just rabies,” says Dr. Patrick Mahaney, a Los Angeles-based holistic veterinarian. “Then I’ll also vaccinate for what are considered to be core diseases—those which are most likely to cause your pet to get severely sick, such as canine distemper virus (CDV) and canine parvovirus (CPV).”
rabies: 관견병
canine distemper virus: 개 홍역 바이러스
canine parvovirus: 파보 바이러스
Mahaney says he also sometimes recommends vaccinating against “other agents which are not considered to be as serious, and are therefore considered ‘non-core,’ such as adenovirus and Bordetella (aka kennel cough).”
adenovirus: 아데노바이러스
Bordetella: 케넬코프
Veterinarians look at a variety of factors when it comes to determining if and when an adult animal needs a booster including the individual’s lifestyle and risk factors, disease prevalence in the area, and the manufacturer’s instructions. For those who are concerned about over-vaccinating their pets, a titer test can provide evidence as to whether an animal has antibodies against a disease, or whether a booster might be a good idea.
On the negative side, Denish says there is no way to predict antibody levels three or six months down the line. Resistance levels can change due to any number of factors, including stress, disease, and medication, so there is a concern that these levels might not be consistent over time.