There are several preventable dangerous diseases that can infect our pets and most of them can be fatal. All of them may cause great suffering and can result in permanent health problems or even death. Due to widespread vaccination, outbreaks of these diseases are now seen less frequently but the diseases have not died out. Whereas it is true that a pet's immunity to a disease may last beyond the recommended booster date, there is no quick and easy way to monitor that immunity. NOT vaccinating regularly is NOT a serious option.