But subsequently a parvo vaccine has helped control its spread, and CPV infection is now considered most threatening to puppies between the time of weaning and six months of age.
Adult dogs can also contract the virus, although it's relatively uncommon.
All breeds of dog can be infected, but Rottweilers and Doberman Pinschers are more susceptible and have less chance of recovering. CPV affects only dogs, and cannot be transmitted to humans or other species. However, other animals and humans can carry it to dogs. Dogs who become infected have a 50-50 chance of survival. If they survive the first four days, they will usually recover rapidly, and become immune to the virus for life.