The main causes of parvovirus in dogs are as follows:

Contact infection: Dogs may be infected with parvovirus through contact with The virus is contracted by direct contact with other dogs, such as in kennels, parks, or other places where dogs gather.

Indirect contact: The virus can be present in the feces, saliva, urine and other secretions of infected dogs, and other dogs can become infected through contact with these pollutants.

Weak immune systems: Some dogs may have weakened immune systems due to their young age, malnutrition, stress, or other health problems, making them more susceptible to parvovirus infection.

Not vaccinated: Vaccination is an important measure to prevent parvovirus. If dogs are not vaccinated up to date, they have lower resistance to parvovirus.