You've heard of parents not wanting to vaccinate their kids for fear of serious illness or even autism - but what about for dogs?
It's a controversial topic that's gotten the attention of veterinarians like Dr. Janine Oliver.
"You can definitely cause harm over-vaccinating, but vaccinating appropriately, the vast majority, 99.9999% of animals are going to benefit," says Oliver.
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So what's the difference?
Dr. Oliver suggests sticking to the core vaccines - like those for Rabies and Parvo.
She doesn't recommend getting any vaccines that won't prevent major illness.