Your body's ability to destroy pathogens that it has previously encountered is termed
Antibodies
Immunity
Vaccination
Inflammation

Antibodies.

When your body gets sick it has to fight off the bad guys. Once it spot off the bad guys it forms antibodies to those bad guys. The next time you get sick with the same thing you must likely have the antibodies to destroy pathogens.

As long as it was one lick and the dog is a bigger dog, it should be fine. watch it carefully for a few days.

Answer up to 6,000 fatal crashes a year;