
My family have always kept an entire male and several females together until very recently. In more recent times, we sent one or another away to the other elkhound household - the sex of the holidaying animal depended on the sex of the other dogs currently in residence at the other house. So when my parents had an entire dog and bitches at their house, and I only had the one entire bitch, their in season bitch would come to me - when I had an entire bitch and dog, my dog went on holiday with them. As my bitch was a late ovulator and was attractive to other dogs for a while after her season should have finished, I had to wait a bit longer than the three weeks and then reunite them under supervised conditions for the first few days until I was sure she was right out.
In the early days, we kept them together under the same roof, but it's easier to send them away if you can. It's kinder to the males, and there's always the danger that someone will leave a door open. It's happened before to other people I know.