
feeding is a very individual thing. My dogs that weigh 20kg only get 200g or a little less of Arden Grange Adult (not the classic).
You will have to go by his condition. You should be able to see a waist when you look at him from above, and be able to easily feel th4e outline of his ribs, but not be able to see them, except the point where the waist goes in. To me the amount you give sounds a lot, but maybe that is how much a growing Beagle pup will burn off!!! :D