Just curious, did Rutherford have a chip? If so, the chip rather an the vaccines may be the culprit. W believe that many pet owners do not realize that the chip is the problem, not the vaccine injection site....
And now that I've watched my Scotty boy die of cancer, you bet that miniscule % of 'what might happen' would stop me from chipping again. There are other ways to identify your pet including a tatoo! We've heard of pets being euthanized because the chip reader would not scan the chip....if anyone bothered to check and see if there is a chip!
Pet owners, like me, go into this blindly, believing what the chip mfgs say on their sites about the chip being 100% safe....wish I'd done my homework, if I had just googled pet chip cancer I never would have chipped Scotty....there are a lot of cases out there!