“Cancer is increasingly common in dogs and disturbingly, canine cancers are occurring at younger ages,”
"Cancer is among the most common causes of death for dogs (and cats) and humans in the developed world, even though it is uncommon in wildlife and other domestic animals."
Of course, every link I look up states any reason except the most obvious. And of course they sometimes contradict each other. Back in the day I never heard of anyone's dog dying of cancer. Far less people bothered to shoot up their dog with vaccines. My dog has lived a full life with no problems, I never got it vaxxed cause y'know, it's a fucking animal. But my brother's wife made sure to 'do all the right things' and that dog died from cancer after only 4 years.
