I am not in practice yet, but I know that a lot of anti-vac people don't vaccinate their pets for the same reason they don't vaccinate their children. They think it's going to do some sort of harm to them, not understanding that most modern injectable vaccines only contain harmless inactive viruses instead of active viruses, which can make you sick. Many people are also concerned about the mercury content of vaccines causing neurological issues, not understanding that mercury is now obsolete, that it is only present in trace amounts in veterinary vaccines, and a that trace amount of mercury isn't usually enough to cause problems (at least in dogs) unless the animal can't effectively eliminate it. They also don't understand that, although some natural remedies can boost the immune system and suppress symptoms, they cannot prevent illnesses nearly as well as a vaccines can. Plus, some natural remedies can be harmful, especially if they have plant allergies.
I believe the issue here is ignorance and lack of education about vaccines. If everyone knew about how far vaccines have come since their invention in the 1800s, they would probably be lining up to get them (pets, too).
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