What is Parvo known to primarily affect in animals?

Parvovirus, commonly referred to as Parvo, is primarily known to affect dogs and cats, which is why the answer points to both these animals. In dogs, the virus causes a highly contagious disease known as canine parvovirus infection, which is characterized by severe gastrointestinal symptoms, including vomiting and diarrhea. This condition is particularly dangerous for puppies that are not fully vaccinated and can lead to significant morbidity and mortality.

In cats, feline panleukopenia virus (often considered a form of Parvo) can lead to similar gastrointestinal distress and is also highly contagious. This virus affects the cat's white blood cells, immune system, and can result in severe clinical signs.

Options that suggest only dogs or only cats do not capture the full scope of Parvo's impact, as both species are susceptible and exhibit serious health risks due to the virus. Additionally, while cows and pigs may experience viral infections, they are not primarily affected by Parvo itself, which is predominantly associated with canine and feline populations. Understanding the species specificity of viruses like Parvo helps veterinary professionals identify and manage outbreaks effectively, emphasizing the importance of vaccination and preventive care in both dogs and cats.