Well, yeah. I never mistake women and men in manga, but it's thanks to years of liking the style, I guess.
About Clamp...I'm not a fan. But i think DOGS art is not like Clamp's at all... Clamp is girly, too much for my taste, and they're all starving-looking, both male and female. I bet 90% of world's population wouldn't see the difference XD