If you want to do as much for him to help avoid the potential for cancer, other than the obvious fact that genetics play a major role. I suggest that you should feed him either a no grain, holistic food (ie Innova EVO, or Orijen(canadian made excellent food)) or a raw dog food diet(horizon is canadian made and amazing food). I feed a kibble, raw combo to my dogs and can attest to the amazing benefits, also I have taken many classes, seminars regarding nutrition, along with first hand experience regarding the problems with grains in dog food, etc. I am also actively involved with a canine cancer research foundation and have a lot of info regarding this problem also. Food plays a very significant role in their health. PM me if you want some info on where to get these, and any other nutritional info if you want to.
I think Titan would be a good name for him!