My dog is on day 14 of her heat, and has been with the male since day 8, but still won't stand for him. Dogs in her line usually breed around day 8, so we are worried. Everything I read says something different -- some sites tells me that dogs can breed all the way up to day 21, some sites say day 18, and others say something different. I'm hoping to actually get some opinions from people that have breeding experience about whether or not they've had dogs breed late. Alot of my friends breed and from their own experience, they feel the breeding won't take. will be very upset if it doesn't work out.