ok i could be wrong wouldnt be a first time lol.... foxes are wild animals they are not like the domestic dog...they dont come into heat every 6 months the way some bitches do..or you have the once a year bitch...they can come into heat anytime or any month,,,,like december or august! but the fox is tottally different they have been hardwired from day dot to come into cycle late november early december so there cubs are being born height of spring so food will be a lot more plentiful than it would be in the depths of winter, she could barely feed herself this time a year in some places never m