This serine protease is found in dog seminal plasma, its exact physiological function is not known. Preferential cleavage of Arg-|-Xaa bonds in small molecule substrates. Highly selective action to release kallidin (lysyl-bradykinin) from kininogen involves hydrolysis of Met-|-Xaa or Leu-|-Xaa. By androgens. Belongs to the peptidase S1 family. Kallikrein subfamily.