I have been feeding the pups for the last couple of weeks and this is the first problem I've had with one of them being sick. I am feeding them Just Born Advanced Fromula Milk Replacer For Puppies Plus Colostrum. Do they normally take a couple of weeks before the formula don't agree with them? I am planning on calling the vet first thing in the morning. I was just wondering if anyone had any suggestions for me. I really appreciate all of the advice I get here. Thanks-