Why vaccination is important to our animals?

Vaccination is important to help your immune system recognize foreign matter that can cause illness like to our pets. Vaccines inject dead virus or other material that help give our pets immunity to that virus or disease should they come in contact with it later. Another reason it is important that it helps to wipe out disease. The more animals get vaccinated, the fewer there are that will get sick.
When was the last time did you get your pet animals vaccinated?