My dog Bertie has been fed a turkey and rice-based kibble since he was a puppy, and he is now over six years old and very fit. As this diet agrees with him, I have not varied it at all. However, I have recently learned that some rice, particularly brown rice, contains fairly high levels of arsenic, and I am concerned about the cumulative effect this might have on his health. My last two dogs, who were on the same diet, both died from cancer (liver and pancreatic cancer) around the age of nine. Given that a build-up of arsenic is known to cause cancer, to which Boxers are prone, it would seem prudent to switch to a good non-rice-based diet, but which one? Any suggestions (I live in the UK) would be much appreciated.