
It wasn't , as far as I know , a deliberate cross ...one of the Queens Corgis mated with one of Princess Margarets Dachschunds called Pipkin. There have been 8 Dorgis ...called Tinker, Pickles, Chipper, Piper, Harris, Brandy, Cider and Berry.
There is a picture here :
Queen and Dogs (and yes , it says 3 Dorgis in that piece , but I have to assume there have been more since then ;)
Melody