This is a great example of why when a mother raises her pups, the pups, as they mature, do not suffer from overly anxious and hyper-aroused behaviour, as when they are raised with humans. See how the mother calms her pups; she will not reward and therefore reinforce the pups anxious or overly hyper-aroused state. She sets boundaries and enforces with discipline impulse control to calm them.
Now instead of the pups being anxious for feeding, imagine its a pup (or pups) anxious for attention from humans! How many puppy owners reinforce or reward this type of anxious and hyper-aroused behaviour in their new puppy, believing its cute? From my experience, MOST puppy owners! Even many purely positive puppy preschools are encouraging puppy owners to reward and therefore reinforce this type of "cute" behaviour. Overly anxious and hyper-aroused behaviour is NOT cute, its psychologically damaging!
Teaching a puppy impulse control and respecting personal space is so important for the psychological welfare of your puppy. Without this type of enforcement as displayed by this mother in the video, these pups would end up psychologically unstable and overly anxious dogs that would not be welcome in their social group (pack). She knows this instinctively. We need to learn from a dogs natural instinctive behaviour, if we wish to raise future well balanced and psychologically stable dogs.
No more suckling says mother....