
Without being too graphic were you able to ascertain if there was penetration, or was he just humping the air.
Had the dog ever sired a litter, or was he just a hopeful , it smells nice so I'll try my luck.
I have here a bitch, and she was mated on days 20 -22, last time it was days 18 - 20. My bitches usually been fertile from matings at days 13 to 18, and that seems average for the breed.
Have you contacted the bitches breeder to find our when her mother and female relatives was fertile, though this doesn't guaranteer, as my late ovulater is daughter to an average one, and her litter sister was same as Mum the more usual 14 to 18 days.
If you think there was any chance that a mating took place (penetration, you don't need a tie) then I would wait 28 days from when this happened, have her scanned by a vet experienced in pregnancy diagnosis, and have the Alizin injection to terminate the pregnancy if she is pregnant.
You could of course have the injection sooner, but some vets do not like giving them if there was no proven mating.
As for gauging when the season has finished, again without being too graphic, her girlie bits will never be as small as before puberty, but there is a definite look and feel of them when they are not in season. Things will look closed, smooth and full pigmentation (black) will have returned, rat her than the slightly brown/violet look that they can have when swollen.