Final answer:
Canine parvovirus is usually shed for about 3 to 4 weeks after initial infection, although this may vary based on the dog's immune response and individual circumstances.
Step-by-step explanation:
The question relates to the period of time during which canine parvovirus is usually shed after infection. Canine parvovirus is highly contagious in dogs and the shedding of the virus can continue for a considerable time, potentially leading to the infection of other dogs. After initial infection, the virus can be shed in the feces of an infected dog for about 3 to 4 weeks, but it is not uncommon for this period to be shorter or slightly longer depending on the individual case and the immune response of the infected dog.
Importantly, while the shedding usually declines after this period, the environment can remain contaminated with the virus since it is quite hardy and resistant to many common disinfectants. Therefore, it is crucial for dog owners to practice good hygiene and sanitation measures if their dog has been infected with parvovirus, to prevent the spread to other animals.