Tenafly Veterinary Center

Pet Vaccinations: What To Expect

It is common for pets to experience some or all of the following mild side effects after receiving a vaccine, usually starting within hours of the vaccination. If these side effects last for more than a day or two, or cause your pet significant discomfort, it is important for you to contact your veterinarian.

What To Look Out For

Common Side Effects:

  • Sleepy/Lethargic
  • Shaking
  • Sore/Stiff
  • Loss of appetite

Un-common Side Effects:

  • Swelling of the face
  • Non-stop itchiness
  • Persistent vomiting and/or diarrhea
  • Collapse

Homecare Information:

  • Side effects may last 24-48 hours after vaccine
  • Offer soft, warm food to encourage pets with loss of appetite
  • Normal body temperature should range between 99.5-102.8°F
  • Benadryl can be given to alleviate symptoms:

Tablet or capsule 25mg:

  • ½ tab for every 10lbs
  • 1 tab for every 20-30lbs
  • Claritin
    • Small – 5 mg by mouth every 24 hours
    • Medium – 10 mg by mouth every 24 hours
    • Large – 15 mg by mouth every 24 hours
  • Give every 8-12 hours as needed
  • Home Care After Vaccinations | View pdf