Officials at Chicago's O'Hare airport told 17-year-old Jon Meier the chewed-on document was fine, but authorities in Miami rejected it and wouldn't let him board the southbound aircraft.

His family's 1-year-old golden retriever, Sunshine, chewed a corner of the document, obscuring some numbers. Meier couldn't get another passport in time to join the trip with his Spanish class from Eau Claire North High School.

The 12-day trip ended Monday. Meier says he can't blame anyone, not even Sunshine: "I love her too much."