MULTIPLE EGGS AND IN HEAT , AND MORE THAN ONE MALE CAN MATE THE FEMALE DURING THEIR HOT PERIOD, HAVE YOU SEEN PUPS THAT LOOK TOTATLY DIFFERENT FROM EACH OTHER. wE HAD A DOBERMAN,,FEMALE , WAS IN HEAT IN FENCED IN YARD. CAUGHT NEIGHBORS DOG AFTER THE DEED, GERMAN SHEPPARD, THEN THAT EVENING A STRAY WAS IN THE YARD, AND NO DOUBT A BIG BROWN AND WHITE hOUND DOG. pUPS BORN 10 TO BE EXACT 3 WHITE AND BLACK AND BROWN PUPS LONG EARS..THE OTHER 7 WERE GREY, LONGER HAIR WITH DOBERMAN NOSES. SO i BELIEVE THEY CAN BE IMPREGNATED WITH MORE THEN ONE DOG.