It's the first day of school and Kate is having trouble getting a couple of her daughters motivated to go. Betty Jo has a new friend, a little dog that follows her back from school. Kate refuses to let Betty Jo keep the dog, despite it being cute and well trained. Kate believes that he must belong to someone. Betty Jo brings him back to school, but he stills follows her home. Kate decides to let the dog stay until the owner claims him or until the dog starts to cause problems for the family. The dog does end up causing some problems, but Kate has a change of heart and let's him stay.

Betty Jo wants to enter Dog in a contest to make a commercial for Tailwagger Dog Food. The winner also receives a $500 cash award. Kate tries to discourage Betty Jo because Dog doesn't have a chance against purebreds. The girls are thrilled when they receive a letter telling them that Dog is one of the five finalists. The letter also says that Mr. Talbot with the dog food company will be coming by to see Dog. What they don't know is that Henry Brewster, the local photo-finisher, who sent in both his and the Bradleys' entries, got the pictures interchanged. This means that Mr. Talbot was really naming Henry's collie one of the five finalists. But after meeting Dog, Mr. Talbot has an idea for a whole series of other commercials. He would like to use Dog and the entire family. Uncle Joe's meddling may ruin everything and Dog may have a say in how things go.

The girls are trying to learn some Japanese to make Betty Jo's Japanese pen pal, Nobuko Takamura, feel at home for her visit. Nobuko has come to the US to attend college to improve her English so that she can teach it back in Japan. She would also like to learn American customs. Nobuko tells Joe that in Japan, the women do the yard work. Joe gets Nobuko to do his chores until Kate puts a stop to it. On a picnic, Nobuko can't help but serve Billie Jo and Bobbie Jo's boyfriends. Kate tells Nobuko that the men should be the ones helping the women. Nobuko catches on to that custom quite quickly.