I believe there was one survivor, and that was Joy, Alexis's spaniel who was found in the Ipatiev House by P. Gilliard when he could enter the house some days after the massacre, and later on brought to England near Windsor. And the pets were part of the IF. They helped in sharing sufferings and sorrows during these last deadfull weeks.
Wasn't there also a dog's skeleton among the bones dragged off the mine shaft, later identified as Jimmy, Anastasia's King Charles spaniel, and isn't this dog by now burried with the IF in Moscow Kremlin ? How did they manage to identify the dog ? Or is it only a king of deduction, knowing that 3 dogs followed the IF to Tobolsk and then Ekaterinburg : Joy who survived, Ortino who is last reported with Tatiana at Ekaterinburg's railway station and then completely disappeared ( though some historians say that Ortino was shot dead a few days after the massacre ) and Jimmy. The " organizer of the murder " wrote that he " seemed to remember that one of the GD was holding a little dog in her arms when getting down to the cellar ". Hence it must have been Anastasia holding Jimmy ?