I just wanted to say, in my defense

that the only reason I was counting calories, etc...was following the advice in another thread here in order to figure out if we could afford to feed him a premium food rather than a grocery store brand food. I used the numbers to convince my dh that it really isn't that much more expensive to feed Blue Buffalo vs. Beneful, which it isn't.
It is good to know roughly how much food he needs and to be feeding that, though. Like I said, it just seems like a puny amount of food for such a big guy.
P.S.-I also realize dogs are carnivores, etc... but I hadn't ever seen a dog eat like this. My previous two dogs would take one kibble out of the bowl, chew it up, and get another one. That's why I was so amazed when I saw Sam eating for the first time. Good to know that it won't hurt him and that the digestion that needs to take place is going on down there in his tummy.