Side Effects from Vaccines

Vaccinations are given to pets to protect them against harmful diseases. The vaccination triggers an immune response within the pet’s body to protect against a specific disease. It is not uncommon for a pet to experience mild side effects following a vaccination, these are often similar to those that a human may experience.

Common side effects of vaccination include:

  • Mild swelling and/or redness at the site of vaccination
  • Fatigue
  • Loss of appetite
  • Nasal discharge
  • Sneezing
  • Coughing

Less common side effects that require urgent veterinary attention include:

  • Severe coughing
  • Collapse or fainting
  • Breathing difficulties
  • Hives (small, red, raised, itchy bumps all over the body)
  • Swollen face or eyes
  • Severe vomiting or diarrhea

It is important to tell your vet about any previous vaccine reactions, even if you class them as insignificant. If you have concerns prior to vaccination it is advisable to wait at the vets for 30-60 minutes after vaccination so any reaction can be treated quickly.