The wolf finally goes to the third little pig's house further up the road and knocks on the door. Because the third little pig built his out of bricks, the wolf was unable to blow it down when the pig refused to let him come him. The wolf then tries to outsmart the little pig by climbing down the chimney to get in.
Image from: http://www-math.uni-paderborn.de/%7Eodenbach/pigs/pig5.html