Thousands of people across the U.S. are saying their pets are dying or becoming seriously ill from common vaccines. They report seeing a variety of side effects, from tumors to autoimmune diseases to cancer. At the same time, many vets are questioning the ever-increasing pet vaccine schedule that now includes vaccines for obscure illnesses that some say aren’t necessary.

So are these vaccines safe and necessary? The research coming out might surprise you.

“Routine” pet vaccinations can cause side effects, either short or long term. Considering pet vaccines are repeated year after year, the frequency and severity of these side effects in our pets have increased dramatically. Most of the problems involve the immune system. After all, the immune system is what vaccines are designed to stimulate. But they do so in a very unnatural way that can overwhelm and confuse the immune system.” — Donna Starita Mehan, DVM

Let’s take a closer look at pet vaccines and how they’re affecting our beloved pets.

Harmful Ingredients Found in Pet Vaccines

The heavy metals, aluminum and/or mercury (neurotoxins) contained in many vaccines are linked with chronic inflammation that can cause many side effects from brain damage, seizures and paralysis to autoimmune issues like asthma, diabetes and multiple sclerosis.

Other vaccine additives include formaldehyde, a known carcinogen appropriate for preserving dead tissue only (formaldehyde is used in the embalming process). Formaldehyde is known to cause cancer in humans and animals. Is it a just coincidence that cancer is skyrocketing among pets?

Pet vaccines may also include other toxins such as Mono Sodium Glutamate (MSG), a known neurotoxin, sorbitol, and other residual impurities from processing. Many of these toxic chemicals don’t belong in the bodies of our pets and can cause a cascade of health issues as seen now in humans.

Pet Vaccines & Commercial Pet Food: a Toxic Combination for Pets

Richard H. Pitcairn, DVM, PhD, is the founder of the Academy of Veterinary Homeopathy and coauthor of Dr. Pitcairn’s Complete Guide to Natural Health for Dogs & Cats. He has been steadfastly saying the two major contributors to ill health among pets today is the overuse of vaccines and the feeding of commercial pet foods.

Dr. Pitcairn’s PhD is in Immunology and Virology. He didn’t start out thinking vaccines were a problem. It took him some time to see the clear and unyielding connection, which is vaccines produce chronic disease and vaccine-induced diseases. In other words, animals vaccinated often have a lifetime of illness and disease with steady visits to veterinarians (and more prescription drugs). As a result, the pets are often sentenced to a shortened and lower quality of life.

Dr. Pat Bradley, DVM states, “In a general and frightening context, I see the overall wellness and longevity of animals deteriorating. The bodies of most animals have a tremendous capacity to detoxify poisons, but they do have a limit. I think we often exceed that limit and overwhelm the body’s defense system function with toxins from vaccines.”

Dr. Charles E Loops, DVM, explains the issue with routine pet vaccination this way:

“The first thing that must change with routine vaccinations is the myth that vaccines are not harmful. Veterinarians and animal guardians have to come to realize that they are not protecting animals from disease by annual vaccinations, but in fact, are destroying the vitality and defense systems of these same animals they love and care for.

Homeopathic veterinarians and other holistic practitioners have maintained for some time that vaccinations do more harm than they provide benefits. Vaccinations represent a major assault on the animal’s immune system…. Vaccine induced chronic diseases range from life-threatening conditions such as autoimmune crises to conditions destroying the quality of life of an animal as in chronic skin allergies.”

Vets Visits or Vaccine Visits? 

Routine pet vaccination schedules have increased dramatically since the mid-20th century. During the 1950s through the 1970s, veterinarian visits were rare and revered for severe injuries. But as more pharmaceutical companies began to focus on vaccines for profit, the medical push to take our pets to regular vet visits began to mimicked the push to take healthy children for doctor visits — and these visits often revolved around the vaccination schedule. Many of the common health issues that are now seen in pets are also seen in children, not surprising because many of the toxic additives are used in human and pet vaccines.

Now it’s common to hear pet parents discuss the latest health issues happening with their dogs and cats, but often they don’t realize these issues could be side effects of vaccinations and their toxic additives. Most are completely unaware of the science linking vaccinations to increasing health issues in humans and the possible effects on their pets. This is especially the case for pets subjected to repeated vaccinations with one-size-fits-all dosages.

The Dose Doesn’t Fit the Dog (or Cat)

Many pet parents are unaware that in addition to vaccines that are repeated at annual vet visits, the dosages given are not proportionate to size. You may have taken a child to a doctor and had the doctor weigh the child to determine the correct dosage of a medication.

This same logic of dosing by weight does NOT apply to pet vaccinations. Whether your pet is a 100-pound Great Dane, a tiny terrier mix, or a five-pound cat, vaccines are one-size-fits-all. This means that the smaller your pet, the higher the risk of vaccine damage.

“Does that make sense to you?” Mary Zalewski said, who lost her dog to vaccines. “Because that little one’s gonna take a hit. They’re doing it repeatedly, blindly, every 3 years, and some every year. The dogs don’t have a chance.”

Zalewski lost her dog, Bentley, in 2016. His health problems began when he received his routine vaccinations and the problems only grew worse until he passed.

“He suddenly blew up. He gained 10 pounds. I’m like, ‘What’s happening?’ We didn’t change his food,” she said. “The fact that we kept having all these health issues added on top of each other, so it was kind of like what… what else could it be?”

Right now, every single dog, regardless of weight or size, is getting the same dose of each vaccine. And the toxic additives in pet vaccines — just like human vaccines — accumulate in the body, often beginning with one health issue that leads to more issues as time goes by.

Do Dogs Really Need a Kennel Cough Vaccine?

According to some aware, honest veterinary experts, the so-called “kennel cough” is not so dangerous and contagious as it’s made out to be. It’s like a cold among humans. The vaccine is also likely to be ineffective. There are 40 or more pathogens or viral strains that can create kennel cough, but the vaccine contains only two strains.

Highly respected Professor and researcher at the School of Veterinary Medicine, University of Wisconsin, Dr. Robert Schultz has openly stated, “Kennel Cough is not a vaccinatable disease.”

The “kennel cough” or Bordetella vaccine contains an attenuated or modified live virus and, as mentioned, is likely to be combined with the parainfluenza vaccine. Thus, the kennel cough multivalent vaccine is capable of infecting other animals via a process called viral shedding for up to seven weeks. Viral shedding can also create more virulent viruses than common natural wild viruses.

Money Motivation Creates a Dangerous Push for More Pet Vaccinations

Few health practitioners and scientists within human health circles acknowledge the fact vaccinations can lead to severe adverse reactions, and even death. Why? They may lose their job, they are marginalized by the media, ridiculed by their peers, and even harassed by Big Pharma and bureaucratic medical associations.

This is the same for veterinarians.

So why would some veterinarians who would benefit from the increased revenues associated with giving more vaccines speak out against them — when they have so much to lose? Could it be that some vets are more concerned about animal health than making money?

Dr. Shultz, who was quoted earlier, is more than a professor of veterinary medicine. He is an immunologist and researcher who has conducted experiments to prove dogs and cats do not need follow-up vaccines and booster shots once vaccinated. Many veterinarians still recommend annual visits that include repeated vaccinations. According to Dr. Shultz…

“Annual re-vaccination provides no benefit and may increase the risk for sue effects and adverse reactions. Profits are what vaccine critics believe is at the root of the profession’s resistance to update its protocols. Without the lure of vaccines, clients are less inclined to make yearly veterinary visits. Vaccines add up to 14% of the average practice’s income, AAHA [American Animal Hospital Association] reports, and veterinarians stand to lose big.”

Studies on Pet Vaccine Dangers:

Current knowledge on feline injection-site sarcoma treatment

“Feline injection-site sarcomas (FISS) are malignant skin tumours of mesenchymal origin that develop in 1–10 of every 10,000 vaccinated cats. The most accepted hypothesis is that a local post-vaccination (or injection) inflammatory process leads to neoplastic transformation. This hypothesis is supported by histological findings of a central area of necrosis and the presence of inflammatory cells, including multinucleated giant cells, which have phagocytized a greyish-blue material consistent with the aluminium-based vaccine adjuvant in some cases.”

Final Report to the Hayward Foundation and The Great Dane Health Foundation of a Study Titled Vaccinosis in Great Danes

“As in two previous studies we conducted, we confirmed that vaccinated dogs, when compared with non-vaccinated dogs, have a higher concentration of antibodies in their serum directed against bovine proteins such as thyroglobulin and fibronectin. These antibodies are probably produced in response to contaminants from fetal calf serum commonly used to make canine vaccines. These anti-bovine antibodies probably then cross-react with a dog’s own thyroglobulin and fibronectin, resulting in detectable concentrations of autoantibodies in their serum.”

Evaluation of antithyroglobulin antibodies after routine vaccination in pet and research dogs.

“In the research Beagles, there was a significant increase in anti-bovine thyroglobulin antibodies in all vaccinated dogs, compared with control dogs. There was a significant increase in anti-canine thyroglobulin antibodies in the 2 groups of dogs that received the rabies vaccine but not in the group that received the multivalent vaccine alone. In the pet dogs, there was a significant increase in anti-canine thyroglobulin antibodies after vaccination but no significant change in anti-bovine thyroglobulin antibodies.”

Virus-associated immunopathology: animal models and implications for human disease*

“Certain experiments have indicated that cells persistently infected with measles or mumps virus (Speel et al., 1968) may be destroyed in vitro by incubation with spleen cells obtained from specifically immunized animals”

Postvaccinal Sarcomas in the Cat: Epidemiology and Electron Probe Microanalytical Identification of Aluminum

The yearly site distributions of all feline nonoral fibrosarcomas received between January 1, 1987 and December 31, 1991 are listed in Table 1. During this time, the percentage of thes tumors in our total feline biopsy population increased from 3.6 to 5.8% (x2(rcnd = 26.1, P < 0.0001), primarily due to increases at selected sites. While the number of fibrosarcomas at noninjection sites stayed essentially the same, there was a significant increase (\2„cnd= 11.5, /* < 0.0007) in the following sites: hindlimb, dorsal neck/scapular, dorsal lumbar, flank, and dorsolateral thorax. These are sites routinely used by veterinarians for s.c. and i.m. vaccinations.

Check the rabies vaccination requirements in your state for possible exemptions

More Pets Are Dying From Vaccinations

Vaccinating Cats in the Tail

When administering vaccinations in cats, most veterinarians now give injections in the tail or below the elbow or knee joint in the leg.


Because some cats develop cancer, which has been linked to the aluminum additive in vaccines, at the vaccination site and these parts of the cat are easier to amputate if cancer develops. The study below states the risk could be 1 in 1000 vaccinated cats.

“Feline injection-site sarcomas (FISS) are malignant skin tumours of mesenchymal origin that develop in 1–10 of every 10,000 vaccinated cats. The most accepted hypothesis is that a local post-vaccination (or injection) inflammatory process leads to neoplastic transformation. This hypothesis is supported by histological findings of a central area of necrosis and the presence of inflammatory cells, including multinucleated giant cells, which have phagocytized a greyish-blue material consistent with the aluminium-based vaccine adjuvant in some cases.”

What do the experts say?

“Annual revaccination provides no benefit and may increase the risk for adverse reactions. The percentage of vaccinated animals (those vaccinated only as puppies) protected from clinical disease after challenge with canine distemper virus, canine parvovirus and canine adenovirus in the study was greater than 95%.” — Dr. Ronald Schultz, a Professor and Chair of the Department of Pathobiological Sciences at the School of Veterinary Medicine.

“Many people are very concerned about vaccinating their animals and the adverse reactions are often referred to as vaccinosis and miasms which is said to be difficult or impossible to cure. Most wonder why “annual boosters” are given to our animals when vaccinations for humans last for our lifetime. Also asked is why isn’t the dose adjusted for the size of the animal? The many serious adverse reactions may be grossly under-reported to the vet (insist on telling the vet), to the manufacturer, and to the USDA Biologics Hotline.” — Dr. Don Hamilton, DVM

“Vaccinations represent a major assault on the body’s immune system… Vaccine-induced chronic diseases range from life-threatening conditions such as auto-immune crises to conditions destroying the quality of life of an animal as in chronic skin allergies.” — Dr. Charles E Loops, DVM

“We should not allow politics and tradition or greed to enter the decision (on the frequency of vaccination). Changing vaccination schedules doesn’t have to mean less profit, but that you have more income from some clients and less from others. Veterinarians and the industry need to have guts to be honest with ourselves and assess the risk and not be trapped in tradition.” — Dr. Dennis Macy in “Are We Vaccinating Too Much?” AVMA Journal, 1995

“55% of all illnesses reported by participants occurred within the first three months of vaccination. Arthritis – Diarrhoea – Allergies -Dry eye/conjunctivitis – Epilepsy – Loss of appetite Nervous/worrying disposition – Skin problems – Nasal discharges – Vomiting – Weight loss – Behavioural problems – Tumour or growth.” — Catherine O’Driscoll, founder of Canine Health Concerns and an author for Dogs Naturally

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  • Go to a holistic vet and get titers done instead of the rabies vaccine:
  • If your pet has had adverse reactions from vaccines or is sick, you might try getting your vet to sign off on this vaccination waiver
  • There is great info here on titers and Dr. Robb contact them by mail if your vet refuses:
  • Read Dogs Naturally Magazine and follow the latest updates here:
  • Homeoprophylaxis can often work as a substitute. Also, not ALL states actually require rabies or other vaccines… make sure you understand the laws rather than just assume what your vet or others tell you is true. Some pet owners who keep their pets at home/inside simply fly under the radar.
  • Go to a holistic vet, they’re usually more willing to write an exemption for your pet.

Just as the incidence of Autism-Spectrum Disorders (ASDs) has risen alarmingly in children over the last half-century, there is evidence that similar behavioral disorders have been observed in pets, most widely reported among pet dogs. It is too early for mainstream veterinary authorities to confidently confirm that dogs can develop autism, but there are numerous reports of behavior patterns in pets that mirror autism behavior in children.

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