The dog is infected with parvovirus and has diarrhea, indicating that the dog's condition has reached a very serious stage, and the gastrointestinal tract has begun to bleed or have ulcers.

Parvovirus is a highly contagious virus that is mainly spread through droplets and contact. Therefore, in order to prevent dogs from being infected with parvovirus, owners should take some necessary measures. First, make sure your dog is vaccinated against parvovirus, which is one of the most important measures to prevent parvovirus infection. Also, avoid contact with dogs that have parvovirus, especially during an outbreak. It is also very important to give your dog regular physical exams to keep their immune system healthy. In addition, keeping your dog’s living environment clean and hygienic and disinfecting it regularly can effectively reduce the spread of parvovirus.