This is why I always hit the preview button first. Then I pretty much know right away is something's not right.

Though I will say it'd be nice if there was some kind of check box on the dragon's profile where you could click it and remove them from the breeding list. I'm not afraid of misclicking but most of my lair I have no plans for breeding and it'd be nice if I didn't have to scroll through my entire lair each time I went to set up a nest.