Blue/Maltese Blue Explained
  A Blue/Maltese Blue Dog carries the Gene Formula (ABCdEgmrSt) and will reproduce its color only if bred to a dog of the same color or to a dog that is carrying the blue (d) gene recessively. It can appear in varying shades from very light silver to a deep bluegrey in color. Breeding blue to blue is not advisable, rather breed a blue dog to a dog carrying blue for best results. 
                                                                         MATING RESULTS

Color Index