#7 Initially, corgi helped shepherds – and, chasing sheep, gathering them into a herd, bite their paws. This habit is at the genetic level: they still bite people on the heels, trying to gather them together.
The teeth of the legs themselves do not touch - it is rather an unpleasant pinch. This is especially evident among young puppies who are not yet raising - but the dog can be weaned from this habit if desired.