Sorry to say this but I think the question is asking you what event would make you feel as happy as billy, not anyone else.
Answer: As he sat on the curb in front of the school, Tico twirled a stick in his hand.
Aunt Maricel would be there soon. Tico felt nervous because he knew she
would ask about his trumpet, and he would have to explain everything.
Explanation:
In Call of the Wild, Elmo is Buck's dad and Judge Miller's best friend