2, Mar 2023
Can Vaccinations Make Your Pet Feel Sick?

Taking your cat to the veterinarian for vaccinations is one of the essential things you can do to protect them from many diseases and ailments, but what about the risk of allergic reactions? Despite the rarity of adverse reactions to pet vaccinations, it is essential to recognize them and understand the necessary next measures. The benefits of proper immunization exceed its risks. Nevertheless, as is frequently the case in medicine, vaccines for pets can cause unpleasant consequences. This post will cover some common vaccination reactions in animals.

How many pets experience severe adverse reactions to vaccines?

Veterinary procedures, such as the administration of immunizations, are always risky. However, the likelihood that your pet may experience a serious adverse effect from a vaccine is extremely low. However, it can be alarming for pet owners who have a negative reaction.

What side effects can vaccinations have on cats and dogs?

Most vaccine side effects in pets are mild and transient, making them significantly less harmful than the diseases against which they are protected. Vets in Stanwood have identified some of the most frequent side effects that dogs and cats encounter after receiving a booster dose or vaccine, including:

Lethargy With a Mild Fever

The most common adverse reactions to puppy and kitten vaccinations include lethargy, a mild temperature, and minor pain. Your pet’s unusual behavior characterizes this. This is a frequent side effect of vaccinations, and the symptoms should be mild and last no longer than two days. Consult a veterinarian if your dog or cat begins to behave abnormally within a few days.

Swelling in a Specific Area

Common side effects in both dogs and cats include lumps and bumps. The site where the needle penetrates the skin may develop a small, firm bump. This is a natural response, but pet owners should monitor the area to ensure that the lump does not grow or exhibit signs of irritation, leakage, or infection. The lump here should not be painful and should disappear in approximately one week. If the lump exhibits signs of infection or persists after a week, you should consult a local veterinarian.

Sneezing and Other Cold-Like Symptoms

Although most vaccines for cats and dogs are administered via injection, others are administered via drops or sprays into the animal’s eyes or nose. With symptoms such as coughing, sneezing, and a runny nose, intranasal vaccine side effects resemble a cold. Your pet should be completely recovered within one or two days. Contact your veterinarian if the symptoms of your cat or dog do not improve within 48 hours or worsen.


Keep in mind that the likelihood of your pet experiencing a negative reaction to vaccinations is relatively minimal. Notify your veterinarian if your pet has experienced vaccine-related side effects; he or she may consider eliminating a particular immunization in the future. The likelihood of vaccine reactions increases slightly when multiple doses are administered on the same day, particularly in smaller animals. To reduce the possibility of an adverse reaction, your veterinarian may administer your pet’s vaccines across multiple days.