I have a puppy that is about 3 days old and she was fine the last 2 days but today she seem SO WEAK!!! She can't even hold on to the nipple, so I supplement fed her ,but she only ate really little.....she's still pretty warm and the mom just keep on licking and licking...anything I can do to help? I called the vet and they said I should just tried to feed her...anything else I can do?????