Print page content Print
Increase text size Decrease text size
Text Size
Vanguard CIV H3N2/H3N8 Logo


CIV H3N8 was already an emerging concern within the veterinary community when the highly contagious CIV type H3N2 was identified in the U.S. in March 2015 and quickly spread across 39 states.1,2 In response to this outbreak, Zoetis was the first to offer a vaccine to protect dogs against H3N2.

CIV is highly contagious and can be difficult to diagnose and potentially difficult to treat. Prevention against both types of CIV remains the best course of action to reduce the risk of outbreaks and develop herd immunity within your community.

Canine Influenza Virus POsitive Cases by Virus Type 2012-2018
All Canine Influenza Virus (H3N2 and/or H3N8) Positive Cases 2012-2018


A number of diagnostic challenges and quarantine requirements underline the advantages of vaccination:

  • Clinical signs do not emerge until after the majority of virus shedding has occurred.
  • Samples collected during clinical exams may not identify CIV due to in intermittent and short duration of viral shedding.3
  • Virtually all dogs exposed to canine influenza virus become infected.2
  • CIV may be associated with other infections as part of Canine Infectious Respiratory Disease (CIRD).
  • In some cases, symptoms can be severe, including moderate nasal discharge, coughing, sneezing, depression, retching, labored breathing and fever (>39.5 C).
  • Dogs infected with CIV H3N2 may require an extended isolation period.4

Risk Implications for Clinics

Regardless of quality of care, outbreaks of CIV can lead to severe consequences for practices:

  • Damage to the hospital's reputation.
  • Need for suspension of services such as boarding, daycare and grooming.
  • Intensive decontamination protocols.
  • Diversion of healthy patients to other practices.



Mon–Fri, 8:30am–8:00pm ET

This site is intended for U.S. Animal Healthcare Professionals. The product information provided in this site is intended only for residents of the United States. The products discussed herein may not have marketing authorization or may have different product labeling in different countries. The animal health information contained herein is provided for educational purposes only and is not intended to replace discussions with an animal healthcare professional. All decisions regarding the care of a veterinary patient must be made with an animal healthcare professional, considering the unique characteristics of the patient.

All trademarks are the property of Zoetis Services LLC or a related company or a licensor unless otherwise noted. ©2021 Zoetis Services LLC. All rights reserved.