![]() How Long Are Puppies With Parvo Contagious? To top it off, certain breeds of dogs are at an increased risk of parvo: A combination of parvo and a secondary infection or a parasite can also lead to a more severe case of parvo in puppies. The stress of weaning can lead to a more severe case of parvo n puppies, as stress weakens the immune system. Puppies should receive a dose of canine parvovirus vaccine between 14 and 16 weeks of age, regardless of how many doses they received earlier, to develop adequate protection. They are vulnerable to the disease until they have received all three shots in their vaccination series, which means owners need to take extra precaution during this time to prevent their puppies from contracting the virus. Puppies are vaccinated against parvo at approximately 6, 8, and 12 weeks of age. ![]() Puppies younger than six weeks old still retain some of their mother’s antibodies, assuming that the dam received her full series of parvo vaccinations. Puppies ages six weeks to six months are the most susceptible to parvo. Parvo in puppies also affects the bone marrow and lymphopoietic tissues, and in some cases can also affect the heart. The virus prefers to infect the small intestine, where it destroys cells, impairs absorption, and disrupts the gut barrier. ![]() The Merck Veterinary Manual classifies the virus as a disease of the stomach and small intestines, as this is where the virus does the most damage. ![]()
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