These are two great videos done by Dr. Karen Becker with an interview of Dr. John Robb that best summarize what has been going on in the veterinary community for decades.
Keep in mind that these are videos are not meant to argue that vaccinations are bad. The videos are meant to inform the public about the endemic of OVER vaccinating animals for the sake of profit and withholding known information about the side effects of vaccinations. Please do your own research to weigh the pros and cons of different vaccination schedules:
Watch both videos:
This is an intro, done be Dr. Karen Becker, to the source of the dilemma:
This video is a must watch to see what is happening in the trenches to a veterinarian, Dr. John Robb, who is standing up to for his beliefs: