You know, there was one sentence that stuck out to me in the first article, something I had been wondering about while reading it before I had even gotten to that part.
Trauma and inflammation at the site where the microchip is implanted could be responsible for tumor development, rather than anything inherent to the microchip
It makes me wonder if, perhaps, the trauma of always having vaccines/microchips/movement inside the skin of that area could be causing an internal reaction?
So, perhaps, everyone is right about it, in a way. I mean, if that's the case, then certainly, over-vaccinating and microchipping could be a factor in why these dogs are getting cancer, and perhaps it's just one more reason to get as few vaccinations as possible to just protect your pets, and...well...only one microchip.
I'm just uneducated about these things, but it could be a theory.