Food Allergies Treatment

The new puppies started weaning a week ago. I got them the ‘Chicken Soup for the Puppy Lover’s Soul’. It’s one of the best, non-garbage, foods that I can afford on a regular basis.
All has been well except one thing. About three days ago (four days after beginning weaning) one of the puppies has started throwing up the milk every time she feeds from her mother. I watched him like a hawk, and I’ve been keeping regular weight-watching. He eats his food just fine. He drinks his water just fine.
He’s not puking up his food at all not even after he feeds. It’s pure milk that comes out.
I’m wondering if it’s some kind of strange developed allergy he’s got or if that’s even possible in a canine. Should I just go ahead and try to stop him from feeding on her since he’s eating and not throwing up food or water? If I do stop letting him feed on her what sort of supplement, if any, should I give him? He’s playing and vibrant as the rest so it looks like his nutritional needs are being met. He’s probably absorbing at least a tiny bit of milk before throwing up the rest. Maybe it’s just that this particular puppy doesn’t need the extra vitamins so it’s rejecting it (like I do when I take too much iron).
Genetics won’t help me here as these are mutt puppies from my rescue that came pregnant. The previous ‘owner’ didn’t know she was pregnant when we rescued her, and couldn’t begin to fathom what sort of dog is the father. I know I’ll end up calling the vet tomorrow to make sure, but it’s late and I can’t sleep so if I can get feedback, why not try, eh?

My baby is coming up on 5 months. My baby is/ has been colicky, spits up frequently, sometimes 2-3 times after every feeding, violent explosive poops, green poop, slimy poop. She used to poop every other day, now she poops 5-6 times a day. I think it is diarrhea. How did you figure out it was a food allergy and what did you do about it?

My son is 10.5 months old and was diagnosed as having a milk/soy allergy. What do other mother’s give their kids to drink? I tried hypoallergenic and Elecare, and he won’t drink it.

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