Wow, although this thread started off a little nasty, there is a lot of good information in it. I am no where near as informed as you guys are but I feel strongly that genetics plays a role in canine cancer, or any other disease for that matter. While I do believe that a proper diet is essential in maintaining good health and possibly a longer life span or maybe a more enjoyable one for your dog, diet is more likely to be trumped by genes. I cannot support this by any scientific journal but dogs have eaten the 'commercial crap' for years and some have gotten sick or died at an early age and some have lived for many years. If you will allow me to make a parallel between human and canince experience, my dad was the healthiest, most physically fit 62 year old man and he passed away from lung cancer 5 years ago. He never smoked, he could beat guys more than half his age at tennis and he ate all the recommended foods every day. Both his younger brothers had died from cancer a few years before him.

Cancer is cancer and whether you feed your dog kibble or raw, it's a genetic crapshoot.