The man nervously glances from side to side like a frightened bird, once Dog goes to sniff the pig and then his crotch the man screams running into the hut "Ah AH AHH!!!" you can see the makeshift door closing shut and hear more glass breaking inside "Run Rupert! he wan't to eat us, RUN you fool!! use the secret door!"
Rupert oinks absently again, the secret door in question appears to be a small hole at the side of the hut big enough for the pig to use at his leisure.