Whether your dog or cat has already been vaccinated or you are considering it for your puppy or kitten, you need to know this first.
Vaccinations are a live dose of an infectious disease injected into the system of the animal.
The theory is that by injecting the body with small amounts of the actual virus, the immune system will be prepared to fight off that particular disease if it ever comes in contact with it later in life. This is a perfect theory with imperfect reality. Many animals actually contract the disease they have been vaccinated for, right after the vaccination or suffer severe ill effects. In addition, there have been numerous reports of both cats and dogs having severe allergic reactions to vaccines. Veterinarians know little more than the pharmaceutical companies train them to know.