As much as it takes to keep the pup at the correct weight.
I know 2 people that have littermate brothers. One feeds 3/4 cup 3 times a day. The other feeds 1 1/2 cups 2 times a day. The pups just turned 3 months old. It also REALLY depends on WHAT you feed. With some kibble, you have to feed twice as much to get the same result as another brand.
we brought our boy home at 9 weeks old. we gave him a cup and a 1/2 in the AM and a cup and a 1/2 in the PM. there's always a treat in between meals. around 4 months we started giving him two cups in the AM and two cups in the PM. he's 11 months old now and he weighs 87.5 lbs. and he's not fat. i think he's a little lean in the hind quarters. my GF thinks he's just right.
My pups are all 1 c kibble and 1/3 can wet (just a bit for the taste) Twice daily...... Sometimes they aren't hungry for one meal and they leave it......
Other times they look for a bit more- when that happens I give them a bit of extra kibble ........
i always feed 3 times a day until they are around 6 months old. usually about 1 1/4 or 1 1/2 cups three times a day all depending on the activity level, gender, size, etc. after 6 months i do two feedings a day about 1 1/2 cups, again it all depends on the size, activity level, etc.
i see some feeding 5-6 cups a day to pups. alot of poop to clean up.
about a month ago my boy (10 months old) decided he didn't like his food. we switched, he ate it with vigor for a few days maybe a week and decided, "go and buy me something else i'm not eating this either". so i had to ask the pros. well they said nothing but water for 3 days no snacks, treats ect. and no food. it bothered me to do this but i did. eats like a champ now. i hope he doesn't stop eating again.
Mandi eats about 1.5 cups in the morning (with gravy on it as the puppy canned food was upsetting her stomach) and about 1 - 1.5 cups in the evening (also with gravy). I try to use some of her food as treats when doing training, too, so that adds a little more as I try to do 3 or 4 5-10 minute sessions everyday. I am finding that at the beginning of the week she is more hungry than she is at the end of the week for some reason. I think she is a little on the thin side, but if she eats her food and wants more, I give it to her, and the vet said she is a good weight (at 13 weeks she was 26 lbs and she is just now 14 weeks so I will weigh her Saturday at puppy class) and that she will start to fill out after she is about a year or so.