I have been very lucky to only have a couple of "problems". The MAJOR problem has been what I suspect to be blood sugar levels dropping. I have to give her Nutracal 3 times per day, or she crashes. She will become very tired, wobbly, and won't eat if she doesn't get it. The other thing is chewing on people. I guess her littermates would have been the ones to teach her not to do that, now we have to train her. It's OK though, I had to deal with that with my last puppy too. As far as feeding her, I have to soften her dry "Go Natural" puppy food and mash it up with a fork, then I add a touch of canned food of the same type just to entice her into eating it. She must eat several times a day, and always have food available.
Otherwise, everthing has gone just fine.