What kind of dog is bosco from the marmaduke movie?

Bosco's breed is a rottweiler, they're killer dogs. I have one, but she is part black lab.

It is a Beauceron, a french breed a short haired version of the Briard

Update (8/5/11) Bosco is a

Beauceron; around since 1809

The breed was found throughout northern France, rather than just in the Beauce region. The Beauceron and the long-haired sheep dog, the Briard, stem from similar ancestral stock, sharing the trait of double dewclaws on the hind legs-they are different!