RIP Tiger.

I came back to this thread to see what others had offered for ideas. I never expected to see he had passed already. I am so very sorry for your loss.

Any ideas which vaccine he had in that spot? My vet and I had recently discussed this vaccine induced cancer. She said that there had been a cluster of issues in the 1980's early 1990's, in USA alone. No other countries. So it was surmised that there was a "bad batch," that something in the processing had gone wrong. She said there hadn't been reported cases in quite some time. Next thing, I see your thread on this!

My cats are indoor only, and now I only get the rabies vaccine for them; required by law. My vet only offers Purevax, which does not use the adjutant which was thought responsible for the sarcoma. Problem is, Purevax is only good for one year. The other rabies vaccine is good for 3 years, which is why we were discussing the matter.