My dog three weeks ago gave birth to 9 sweet puppies. Actually I don't know what breed is she and the new one, but 2 of them which are the weakest of the rest maybe because of starvation didn't gain any weight and today started to lay on floor as i see of health weakness. I separated them and started to give milk to them, but thay just are laying and cant move like others and they are shaking with their body. Other problems is that they are attacked by fleas and they suck their blood. What cure to give to them, acutally what to do with them?