Dog food is perfectly edible. Some of it even tastes better than DintyMoore. I prefer Beanee-Weinies or Spaghetti-Os though. I don't go along with the idea of packing a ration that you knowingly won't eat. If you don't have the self control to budget you supplies wisely then your survival seems questionable anyway. That goes for rations, water(much more important than food), matches or anything else. If you're not planning on eating until hunger makes dog food look appetizing then I think the weight & space would be better used for an extra canteen.

My $0.02

Ed