If the dog dies, can’t we raise it again immediately?

If the dog dies of old age and death normally, then you can raise it again immediately; but if the dog dies of illness, especially a contagious disease, then you cannot raise it again immediately, because the virus may still be alive in the home. If you raise other dogs, it can easily be transmitted to other dogs.
Tips:
If the dog died from a viral infection, it is best to wait half a year or a year before getting another dog dogs, and should be cleaned and disinfected regularly.