The back door - 11 mth progress report

We've had Sunshine for just over 11 mths. And today we had excellent success with him coming in the back door without my having to go out and herd him in! Yeah! Sunshine doesn't come when called, it kind of freaks him out so I have to go out and get behind him to herd him in. I wonder if we should get a border collie or other herding breed and teach them to get Sunshine. I have been trying to train Blossom to do it but she isn't going for it. Good thing he is just so Gosh Darn Cute! No progress on the dog door yet. But I feel like it is going to come someday...