
It could be a number of things. If you are really worried then get the puppy checked out by the vet. As to it gorging on food, I would doubt that, as it would be more likely to get bellyache and cry. It may well be a food intolerance, there are many, milk is an obvious first stop, but I do know of some dogs who can only eat plain white boiled rice and fresh minced lamb, so it might be something in the food. I use Well beloved and have no problem with it, but I would certainly be trying all possible causes.
I'd keep an eye on all the pups as well incase others start being sick after feeding.