Do elderly cats need vaccines? Veterinarian-recommended vaccination criteria and precautions

I'm sure many of you regularly vaccinate your beloved cats. However, there are quite a few owners who think, "My cat is old, so I don't need to vaccinate them." This time, we will explain vaccinations for senior cats.

Do Senior Cats Need Vaccinations? Changes in Immunity with Age

How Does a Cat's Immune System Change with Age?

Cats are considered seniors once they reach 7 years of age. While physical changes are more likely to occur during their senior years, a decline in immunity is one of them.

Immunity is the body's ability to prevent infections by pathogens, where immune cells called white blood cells eliminate and attack pathogens. As cats age, the function of white blood cells declines, leading to a weakened immune system. Cancer is often observed in senior cats, which is believed to be due to the decreased ability of the immune system to detect and destroy tumor cells as they age.

Common Infections in Senior Cats

Cat cold, also known as Feline Herpesvirus Infection (Feline Viral Rhinotracheitis) and Feline Calicivirus Infection, can infect cats of all ages, not just senior cats. Furthermore, persistent symptoms like nasal discharge and coughing can deplete their physical strength.

Cases Where Vaccination is Recommended and How to Determine Necessity

Many veterinary clinics follow the World Small Animal Veterinary Association's "Canine and Feline Vaccination Guidelines" for vaccination. For adult cats and older, the vaccination schedule varies depending on the type of vaccine, living environment, use of pet hotels, and whether they go outdoors, but vaccination every three years is generally recommended. However, if they use pet hotels or live in a multi-cat household with two or more cats, annual vaccination is recommended.

Even for senior cats, vaccination is generally based on the same principles. Since vaccines are primarily administered to healthy cats without illness, vaccination may be postponed if the cat is clearly unwell or undergoing treatment. This decision also varies depending on the veterinarian who examines the cat.

Recommended Vaccines and Vaccination Schedule for Senior Cats

Basics of Cat Vaccinations

Vaccines are divided into "core vaccines" and "non-core vaccines" in the "Canine and Feline Vaccination Guidelines."

Core vaccines are for highly contagious and often fatal diseases worldwide, and are recommended for all cats. The feline 3-in-1 vaccine is a core vaccine, covering "Feline Panleukopenia," "Feline Herpesvirus Type I," and "Feline Calicivirus Infection."

Non-core vaccines are considered based on the cat's situation, such as their living environment. Vaccines for "Feline Leukemia Virus" and "Feline Chlamydiosis" are non-core vaccines.

Vaccines Particularly Recommended for Senior Cats

Even senior cats need vaccinations. Although it depends on their living environment, senior cats should receive the 3-in-1 core vaccine. Depending on their needs, 4-in-1 or 5-in-1 vaccines may be considered.

Appropriate Frequency of Vaccination and Veterinarian-Recommended Intervals

For adult cats and older, the frequency of vaccination varies depending on the living environment, whether they live in a multi-cat household, go outdoors, or are boarded at a pet hotel. If none of these specific conditions apply, core vaccines are administered every 3 years, and non-core vaccines are boostered annually. If your cat is boarded at a pet hotel or lives in a multi-cat household, annual boosting of core vaccines is recommended.

Risks and Precautions During Vaccination of Senior Cats

Side Effects and Allergic Reactions to Vaccination

After vaccination, allergic reactions such as vomiting, fever, and itching can occur. Anaphylactic shock, which often occurs within 30 minutes of vaccination, is particularly concerning. Anaphylactic shock is a rapid reaction that can be life-threatening if not treated promptly. Symptoms include sudden vomiting, drooling, pale mucous membranes in the mouth, and collapse. Therefore, it is advisable to wait at the veterinary clinic for 30 minutes after vaccination.

Other allergic reactions can also occur, such as vomiting, fever, and body itching, several hours after vaccination. These reactions usually subside within a few days. Allergic reactions to vaccines are not related to the number of previous vaccinations, so a cat that tolerated a vaccine before might still experience an allergic reaction this time.

In addition, the vaccinated area may be painful or swollen, but this is usually temporary and resolves quickly. Very rarely, a type of cancer called a sarcoma can develop at the vaccination site (vaccine-associated sarcoma), which requires surgical removal. Since this type of cancer tends to recur, vaccinations are typically administered in a limb that can be easily amputated if necessary.

How to Handle Cats with Poor Health or Chronic Conditions

Vaccinations are generally given to cats that are healthy and have no health problems. Therefore, if a cat is unwell or has a chronic condition, vaccination may be postponed. Since this decision is made by the veterinarian, owners should never decide not to vaccinate. If your cat is unwell, it could worsen their condition, so always consult your veterinarian before vaccination.

Key Points for Owners to Note Before and After Vaccination

Before vaccination, you need to confirm that your cat's health is as usual.

Particular caution is needed after vaccination, as anaphylactic shock, which can occur within 30 minutes of vaccination, can be life-threatening. You should wait at the clinic for 30 minutes and check for shock symptoms such as vomiting, lethargy, or pale mucous membranes in the mouth.

Care is still needed after returning home. Playing intensely with cohabiting cats can lead to stronger allergic reactions. Try to keep your cat as calm as possible. The immune response will occur for some time after vaccination, which can cause your cat to feel unwell. Also, some vaccines use weakened pathogens, which can cause symptoms of the disease. After vaccination, pay extra attention to changes in your cat's health. Avoid shampooing for one to two weeks after vaccination.

Beyond Vaccinations: Other Ways to Protect Your Senior Cat's Health

Importance of Regular Health Check-ups and Early Detection

As cats enter their senior years, they become more susceptible to various illnesses. Their immunity also declines, which can lead to more severe symptoms of infections like cat colds. Vaccinations are a preventive measure to make them less susceptible to the diseases they cover, or to reduce the severity of symptoms if they do contract them. Vaccines themselves do not cure diseases. Therefore, early detection and early treatment are crucial. Regular health check-ups also allow you to understand your cat's current health status. We recommend twice-yearly health check-ups for cats aged 7 and older.

Dietary Management and Lifestyle Habits to Boost Immunity

For senior cats to live a healthy life, diet tailored to their life stage and physical condition is crucial. As they age, their activity levels and metabolism decrease, making them prone to gaining weight, or conversely, they may lose weight due to declining digestive function. Maintaining an appropriate weight helps maintain overall health, including immune function.

Furthermore, stress is known to suppress immune function. Try to minimize stress as much as possible.

Creating an Environment to Reduce Stress

As mentioned earlier, stress impairs immune function. Senior cats, in particular, are vulnerable to environmental changes. Moving, an increase or decrease in family members, redecorating a room, or loud noises from construction can all be sources of stress. It is important to take measures to reduce such stress. When your cat gets older, try to keep their environment as consistent as possible.

Summary

Senior cats experience a decline in immunity, making them more susceptible to infections and other illnesses. Do not assume "my cat is old, so they don't need vaccinations"; continue to vaccinate them even in their senior years. If you have any health concerns, be sure to consult your veterinarian before vaccination.