There are a lot of threads on here about puppy feeding that you could search out for more info, but a lot of folks don't ever feed puppy food. Rather an all life stage food is used. Being a dwarf breed, it is thought that their bone development does better on this food. In any case, I wouldn't feed puppy food past 6 months. The amount varies based on activity level. To me it sounds like you are feeding a lot, but you don't say how old they are. They need more when puppies, but don't get them to used to it! LOL. The worst thing you can do for a corg is let them get overweight. Also, factor in any training treats into their daily consumption.