Gee, I often wondered that myself. My niece's stepdad's dog reminds me so much of Digi with the ears and tail, especially.
Ya know what? I think Digi is so unique, and so gorgeous and so special, that I'm glad she is a super mutt. She will never be replaced or cloned with her beautiful self. I think she is spectacular and I always loved seeing her picture so I can swoon.