Final answer:
The shot that prevents a dog from getting the parvovirus disease is the parvovirus vaccine. It stimulates the dog's immune system to produce antibodies that can fight off the virus if it is exposed in the future.
Step-by-step explanation:
The shot that prevents a dog from the parvovirus disease is called the parvovirus vaccine. This vaccine contains a small amount of the virus that has been modified to no longer cause illness in the dog. When the vaccine is given, it stimulates the dog's immune system to produce antibodies that can recognize and fight off the parvovirus.
If the dog is then exposed to the parvovirus in the future, the antibodies will already be present in its system and can quickly neutralize the virus, preventing the dog from getting sick.