No question is a stupid question...........that's how we all learn.
To answer it, to the best of my knowledge, a dogs nipples will become more prominent when then have their first heat cycle, and will stay that way more so than before even after the heat has ended. If they are bred and become pregnant, the nipples (and breasts themselves) will become even more noticeable. So, unless there was a tie during her heat cycle, I'd say you're more than likely okay and Dora is not pg. Did you know that a heat cycle lasts for about 21 days.......day 9-16 (give or take a few days) being their most fertile time? Hopefully you kept Joey and Dora separated and/or watched closely for the entire heat cycle.
My Halle had her first heat in November and her little nipples are still more pronounced than they were before she went into heat.......but she is NOT pregnant.