Turtle's dog in the Hit Series Entourage (2004–2011) was "Arnold".
He's a Rottweiler whose real name was Rocky. He joined the main cast in the first season and was regarded as one of the best animal actors in recent years (yet lost the golden collar to the dog from Modern Family) because of his proper representation of the canine in the household, always in the background and showing the docile and loving side to a breed shunned by society.
Arnold went from being feared by the group who sent their bagman, Turtle (who even wore a protection suit for their first encounter), to release him from his cage, to sleeping with main cast and even hiding behind Turtle during a break in.
Do you miss the Hollywood boys of Entourage? Watch every episode of the hit comedy series on HBO, plus go behind the scenes of the Entourage movie at HBO.com.