It's hard to tell but I always wonder myself about Tasha because her mother is the only one of her parents whose breed was known by the shelter where I got her. Her mother was Shep/greyhound but I have no idea what her father was. I think he must have been more of a mid-size breed or mix because Tash is closer to a mid-size breed at 50 pounds. To me the greyhound is evident in her but I always wonder what else might be there too. Nala could easily have either Dane or Greyound IMO, they have very similar body builds. Perhaps even like Tash she had a dane or greyhound mix as one of her parents. I think she definitely has lab though.

The shelter had made a guess that Tasha had springer spaniel in her as well but I don't see that in her one bit, even her behavior is more consistent with shepherd/greyhound attributes.

I guess it's something us mutt owners will always wonder at, but it's fun to take guesses