There are lots of healthier options to add caloric add-ins for the puppy. Pancreatitis is always a worry with fatty treats and toppers, as mentioned above. I know more than one person whose dogs have gotten pancreatitis from really fatty treats. Not saying every once in a while you can't break off a small piece of bacon off your plate to use as treat, but I don't think that's the best food additive in this case. Eggs, my dogs get a raw one sometimes on days when they eat homecooked or raw. A crock pot is a good resource for making toppers -- buy stew beef and put that into the crock pot with a little water and carrots; lean ground beef is often on sale so I stock up and freeze it, then cook it unseasoned for my dogs.
Every puppy and every line of Labs is different. If you have a good breeder to rely on, that's a good start to get info about how they raise their puppies and to get benchmarks on weight and feeding. If you don't have a good breeder, then you'll definitely have to eyeball the puppy and add/remove. Male Labrador puppies often eat way more than you would think when they hit a growth phase. The male Labs I have at home arrived at 8 weeks (2 months old) weighing roughly between 17-21 lbs. They've all been around 10 lbs/for every month of age give or take a few pounds -- 30 lbs @ 3 months, 40 lbs. @ 4 months, and so forth. The two adults are now holding at 80 lbs and 90 lbs respectively.
My current puppy was eating about 7 cups of ProPlan 30/20 at 6 months old. That is not unusual for his breeding. There was nothing crazy about his bathroom schedule eating that amount (3 times a day; normal, firm stools). You can see what he looks like below at 1 day shy of 6 months when he was eating the amount noted above. Feeding guidelines on bags are a starting point, but you definitely have to feed the dog in front of you. There will be time to cut back later when he's no longer growing. A good probiotic also can be helpful to balance immature gut flora and help the puppy digest food.
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