A Veterinary Guide: Potential Side Effects of Pet Vaccinations

Vaccinations are primarily administered to protect domesticated animals from fatally infectious disease-causing microorganisms. With that being said, veterinary professionals typically encourage owners to arrange their pets for one. However, they seem to worry about the possible adverse consequences of this preventative measure. So, to ease everyone’s fear, a comprehensive discussion involving this matter will be tackled in this article.

After Effects of Pet Vaccinations


Anaphylaxis is a severe and lethal reaction of a pet’s body to potential allergies from various sources, such as animal bites, foods, and vaccines. When this happens, their blood pressure suddenly drops, causing narrowed airways, which can eventually obstruct their breathing patterns. Consequently, this can activate intensified levels of skin rashes, decreased pulse, and shock, leading to death.


Diarrhea is an uncommon vaccination reaction among pets. However, when this suddenly develops after the scheduled shot, expect to notice a potent bodily response from your furry companion. They might experience ongoing and acute dysentery, leading to significant organ failure. In such cases, immediately have a word with a veterinary internal medicine physician, considering they have adequate knowledge about handling and managing such dilemmas.


Fever is one of the most prevalent side effects of pet vaccinations. It is a normal immune system reaction to locally and systemically administered vaccines. These assertions prove that the administered shot effectively stimulated their bodies’ natural defenses, which is the whole point of this preventative measure. But, if this persists, never hesitate to visit a credible animal facility like Bloom Plaza Animal Hospital for a comprehensive discussion with a veterinarian.


Fatigue is a medical jargon that describes constant perceptions of tiredness and lack of energy. Commonly, this is deemed a predicted side effect of cat and dog vaccinations, considering the heavy feeling and soreness it can induce in the injection site. But, if this lasts for more than a week, instantly search for reliable veterinary websites collaborating with professionals who can immediately respond to these situations.

Localized Swelling

Localized swelling is a widespread pet vaccination reaction for furry companions that have received shots via skin or muscle injection. Typically, these bumps and lumps develop at the inoculation site. Despite these assertions, it is always essential to constantly check on the involved area, ensuring it doesn’t get inflamed. However, if the opposite happens, directly speak with a veterinarian for a timely response.

Loss of Appetite

Loss of appetite is considered quite a common experience for pets that have recently undergone vaccinations. It is usual for these creatures to have an upset stomach, making them feel tired and lethargic, which typically lasts for two to three days. So, if this continues after those anticipated periods, never hesitate to have an appointment with a veterinary surgery specialist. These professionals are experts in dealing with these concerns.

Respiratory Problems

Respiratory problems are common side effects of intranasal vaccines. These types of shots are administered through a drop or spray into the eyes or nose. Consequently, this can bring about numerous complications such as coughing, rhinitis, and sneezing that generally persists for a day or two. However, if your pet doesn’t get any better after this cycle, calling a veterinarian would be an ideal action to take for a detailed aftercare discussion.


Vomiting and loss of appetite constantly come hand-in-hand. When pets do not have proper access to the nutrients they need, their gastrointestinal system can get upset. This can trigger continuous throwing up even if they have nothing to release, considering that they couldn’t effectively eat and drink after vaccination. Apparently, this complication can subside after a couple of days. So, consistent suffering must be immediately addressed by a veterinarian.