In reply to mark turnbull: Chased? They're just being friendly. If you stop and give them a scratch between the ears they calm down, then get bored and go off to find a bit of turf they haven't dug up yet.
And yes, I have met those exact pigs this year, and no, they're not that big, for pigs.
"Never wrestle with a pig. You both get dirty but the pig enjoys it."