The reason why there are Zhou dogs is that in order to make profits, many unscrupulous dog dealers may inject serum into sick puppies to cover up the condition, and then sell them to inexperienced dog buyers. After arriving at a new home, these puppies often become ill and may die within a short period of time because their condition is not treated in time.

And some dogs are too young, have poor physical condition, and have not been vaccinated enough, resulting in low resistance and easy infection by viruses. Especially canine distemper, canine parvovirus, etc. These viruses are extremely contagious and have an extremely high fatality rate for puppies.