2. Some diseases, such as canine distemper and parvovirus, will separate serum from infected and recovered dog blood by centrifugation.

In both cases, the blood of healthy dogs needs to be drawn, and the pet hospital has a fixed group of blood donation dogs, which dogs can do, but it's okay; Some "black-hearted" people will light a cigarette, that is, individuals are blood banks, also known as blood dogs. And those "black-hearted" hospitals even care about their health and life and death, which is very pitiful.