I expected Belle to do everything she normally did when she was in heat. Obedience, agility, hunt training. No problem. The only time I think it figured in was when we were blood tracking a deer. Belle led me right to a pen of male dogs. True, the deer might have gone by there, it was indeed* one of their escape routes from the woods.....but she gave up the track at that point.
It's like anything else. It effects some dogs worse than others. I know that girls can tend to get out of sorts though. Currently there are 2 Springers that are in heat in Essy's obedience class. They act like they don't have a brain cell between them. They are obstinant, have lost all hearing, and really couldn't care less about being there working. Normally these are 2 of the better dogs in class.