you feed raw food the same way to any size or breed of dog, the only thing that differs are the amounts. puppies and adults are also fed the same foods, only in different amounts.
for adults the rule of thumb is 2-3% of the (ideal) body weight per day, or 15-20% per week.
puppies are fed either 10% of their current body weight or 2-3% of their projected adult weight per day.
these amounts are not absolute values and you will have to adjust depending on the condition the dog is in - if he's too thin, feed more, if he's gaining too much weight, reduce the amount you feed.
i highly recommend buying a few good books on feeding raw, it's not rocket science to feed your dog, but there are a few things you need to be aware of.
i recommend
* "raw meaty bones" by dr. tom lonsdale,
* "natural nutrition for dogs and cats" by kymythy schulze
(she's a newfoundland breeder, so she knows giant breeds)
* "k9 kitchen your dog's diet" by monica segal