What is a common indicator of parvovirus infection in puppies?

Severe vomiting and diarrhea are hallmark symptoms of parvovirus infection in puppies. This highly contagious viral disease primarily targets the gastrointestinal system, leading to significant inflammation and damage. When infected, puppies often experience severe gastrointestinal distress, resulting in frequent and severe vomiting, as well as profuse diarrhea, which can be bloody. This clinical presentation is a response to the virus attacking the intestinal lining, leading to dehydration and potentially life-threatening complications if not treated promptly.

Other symptoms like lethargy, loss of appetite, and fever may accompany the vomiting and diarrhea, helping to confirm the diagnosis. This set of symptoms is critical for veterinarians to recognize early, as prompt intervention can greatly impact the outcome for affected puppies. In contrast, seizures, sudden weight gain, and excessive barking are not typical indicators of parvovirus infection, making the identification of severe vomiting and diarrhea as the correct answer clear and relevant.