We had a cat who had a sarcoma at her injection site (back leg haunch). They amputated her leg to try and get rid of it, said they wouldn't know if they got it all until later down the road. I asked why her cancer/tumor would be in her leg like that. It seemed odd that the tumor was in such a specific place. The vet told me it was a common side effect to vaccines. That is why they stopped vaxxing in the neck. It was so common they changed their standard injection site for the purpose of amputating legs that would get these sarcomas, since neck amputation wasn't a choice. Within a year the cancer came back and this time was all over her body. Our cat was only 5 years old. We recently got another cat and I went to a traditional vet with her at first. Asked about the sarcomas and told her the story of our old cat. "No worry," she said. "We now vaccinate further down the leg to be sure we can amputate and get all of the cancer." I was shocked by that response. Said no thanks to the vaxxes offered and found a holistic vet.