Only then did the disease die out. There are strong arguments to suggest that vaccines keep diseases in the eco-system. For example, the only cause of polio in the USA today is the vaccine itself. Vaccines also shed into the environment, so a vaccinated or unvaccinated dog or cat can contract a disease from the urine and faeces of a vaccinated dog or cat. Myth No. 3.
Vaccines are extremely safe.
Myth No. 4. Only a tiny minority of genetically-susceptible dogs will suffer adverse reactions to vaccines. Whilst some dogs will have genetic weaknesses that make vaccines more dangerous to them, there are many other factors which can put your dog at risk. Even if the vet does suspect a link, there is no law to make him report the suspected reaction. Many vets are too busy to complete the necessary paperwork.