My dog just had puppies six days ago and one of the males will not stop screaming and crying. He’s been going at it for almost an hour now and we tried to put him on her nipple to feed but either he doesn’t want it or he will only drink for a few seconds. I have the heater on them and everything so he can’t be cold.? If anyone has any advice on how to make him stop or to help me figure out whats wrong please let me know. He started this out of the blue and just hasn’t stopped.