Unfortunately, force feeding will make the pup resent the kibble and even less likely to eat it. Start fresh with a different brand, so he doesn't associate the kibble with distress. Put the kibble in his bowl and leave the room. Return after 20 minutes and throw any uneaten kibble away. Don't offer anything else until the next meal time, and then repeat. Eventually the dog will learn to eat if he's hungry. Also, check the kibble size is appropriate for the dog, and moisten the kibble with a bit of hot water.