Given the following context:

One night in the Evergreen Forest, Schaeffer the sheepdog is playing with his human owners, Tommy and Julie, when their father, Ranger Dan has a surprise for them. As Schaeffer takes a brief nap, he is awoken by a glowing red plane that lands in front of the cabin. Schaeffer goes to investigate, but the pilot gets a call from his commanding officer to return to his base. Panicking, Schaeffer climbs into the passenger seat of the plane and is flown away from Earth and to a strange jungle planet. Upon his arrival to a giant base filled with weaponry, he's chased by the forces of the Imperial Commander Cyril Sneer, but escapes them. Schaeffer runs into Sophia Tutu, a friend of his from the planet Earth, although Sophia doesn't seem to know Schaeffer. Sophia takes Schaeffer to meet Broo, her pet sheepdog puppy. Meanwhile, Cyril Sneer plans to conquer Earth with the help of a magic star (which Broo wears around his neck). The star has enough power to launch his firepower to raid the planet. He sends out his army to hunt down every animal in the jungle and find the star.
Meanwhile, Sophia, Broo, and Schaeffer are captured by the Raccoons (Ralph, Bert and Melissa). The trio are the only animals left in the jungle. They free Sophia, Broo and Schaeffer finding they are on their side. Sophia then meets up with her boyfriend Cedric Sneer and finds out that Cyril is Cedric's father. After a series of animals being rescued and recaptured, Cyril notices on a security tape that Broo has the star. That night, Cyril discovers a "jungle rendezvous" Cedric is having with Sophia and he follows him and has Sophia imprisoned and soon all her friends, but with Broo and Cedric's help, the Raccoons and the other animals escape from Cyril's clutches and destroy his fortress in the process.
After rejoice, Bert flies Schaeffer back to Earth via airplane. Schaeffer awakes from his long dream and sees that Ranger Dan, Tommy and Julie reveal their surprise to him, which turns out to be Broo.

answer the following question:

What's Broo's owner's last name? 

Tutu