He can use human weapons such as MP40 or Panzerfaust.
A dog named "Bismarck" after historical German politician Otto von Bismarck
He is modelled after the common enemy dog character "German Shepherd", also known to fans as "low polygon dog", first appeared in the 3rd single player mission "Sewer Chase".
As for why Bismarck can carry human based weapon, the backstory was told in "Panzerknaker", the bonus mission of MoH: Underground,. It turned out that ”Bismarck" is the result of a crazy experiment run by a mad German scientist.