Vaccine-Associated Pet Cancers

A growing body of evidence is linking pet vaccines to sarcomas. Tumors are growing where the vaccines were injected in anywhere from 1 in 1,000 to 1 in 10,000 vaccine injections. While most sarcomas are in cats, dogs can also be victims.

A growing body of evidence is linking pet vaccines to sarcomas. Tumors are growing where the vaccines were injected in anywhere from 1 in 1,000 to 1 in 10,000 vaccine injections. While most sarcomas are in cats, dogs can also be victims.

Speak with your vet about the most important vaccines for your pet, and decide together which ones to skip. The University of Colorado has offered a vaccine protocol that can be found at this
website. If you notice a small lump develop at the site of a vaccination site contact your vet immediately.

The Vaccine-Associated Feline Sarcoma Task Force (VAFSTF) has been formed in response to the increased incidence of soft tissue sarcomas occurring at vaccine sites. The goals of the VAFSTF are to facilitate investigation of the epidemiology, etiopathogenesis, treatment, and prevention of these malignancies, as well as to disseminate information to veterinarians and the cat-owning public.

Two brochuresó Vaccines and Sarcomas: A Concern for Cat Owners, and
Feline Vaccines: Benefits and Risksóhave been published by the Vaccine Associated Feline Sarcoma Task Force, and the text can be found
here .

Press releases from VAFSTF are available "">here.

A pdf file of the 2000 Report of the American Association of Feline Practitioners and Academy of Feline Medicine Advisory Panel on Feline Vaccines is available at this link.


.4 years ago

thank you for the sad info

Deborah Johnston
Deborah Johnston5 years ago

If you listen to most 'recommended' vaccine routines for our pets, you are vaccinating too much. Even rabies vaccine should only be repeated every three years (obviously if you are in a high rabies area or if your local laws require more frequent vaccination against the disease then you have no choice). The biggest problem with vaccines, for pets or for humans, is that you are labasting a body with a cocktail of several diseases (inert, live or whatever) at once. That is not a scenario the body is prepared for and you will weaken it.

For humans, think what are the odds that you would come in contact with polio, diptheria, tetnus, measles, mumps, rubella, varicella and a few others all at the same time? Nil. And with that cocktail, then whatever additives there is in the vaccine, it is no wonder there is problems with VAS!

And, I am sorry, Frank H., my response to your comment is to say any responsible pet lover would never allow a pet to suffer. Take your pet to the vet and have it humanely euthanized rather than 'watch it suffer'. If it isn't your pet, call the local SPCA or Humane Society and they will. We have the power to keep our pets healthy and care for them when they are ill. And when the time comes they are in pain and cannot be made comfortable, we have the power to end their suffering.

Ana R
ANA MARIJA R5 years ago

Thanks for the article.

Mary Beth M.
MaryBeth M5 years ago

My cats are indoor cats, but we have dogs who go out, kids and other adults who obviously leave the house and return. The house is not a bubble, the cats sit in the windows, and on occasion go out on the backporch with me. I am not a proponent of indiscriminate vaccination in humans or pets, however, some of these diseases are painful, impossible to treat and lethal, as Frank B. mentioned. I will continue to vaccinate my cats. I used to be critical of heartworm prevention in dogs (even tho I reluctantly gave it), worrying about the long term toxic effects. That is until our newest rescue dog came to us heartworm positive. The 6 months of restricted activity, not to mention the 3 painful injections containing arsenic, are brutal, and I wouldn't wish that on any dog. He did well with our love & support. Both our dogs will be on year round heartworm prevention from now on. I no longer worry about the toxicity-the alternative it too horrible.

Ingo Schreiner
Ingo Schreiner5 years ago

so sad

Teresa Wlosowicz
Teresa W5 years ago

very sad

Frank Hanline
Frank Hanline5 years ago

While VAS is indeed a real affliction and quite honestly, vaccines protocols for animals is nowhere as stringent as human vaccines, I will continue to vaccinate my cats

I know all about VAS. My cat Bumper died of it last year. Still, he was an outdoor cat, 15 years old and loved to hunt. He was a high risk cat. 15 years is at the upper end of an outdoor domestic cat's life expectancy.That he died like that sucks but the alternative is worse

Had he not had his vaccinations, he might not have made it past 5 years. If he didn't have the vaccinations, heart worm, etc, his life expectancy wouldn't have been much longer than that of a feral cat, 5 years. Because of that, all my cats are fully vaccinated and will remain that way

Ever seen a cat die from Feline Leukemia? I have. Now Bumper went very quickly, not like the cat down the street crying in pain from the leukemia. So when you watch a cat die from leukemia or catch a rabid mouse in your house and have to be put down and you get the rabies vaccine yourself, then you may think the 1 in 1000 chance over a lifetime is well worth the risk

Winn Adams
Winn A5 years ago

Thanks for the info.

Brenda Towers
Brenda Towers5 years ago

Very concerned.

Sofia Natsis
Sofia Natsis5 years ago

So scary.

I think for the most part, indoor pets, healthy indoor pets, don't need to be vaccinated yearly.