When you meet the leader dog you have to bow to show your respect. Dogs are pretty great, so the leader of all dogs must be the greatest! You should bow really deeply to this one.
You bow as low as you can, but you lose your balance and fall over. "F**k you (ふく)!" the leader dog barks. Oh no. You messed up and now the leader dog is super mad. Saying f**k you is a little harsh for falling over though, you think.