I have an entire dog and an entire bitch. Unless you have a house set up where you can keep them completely apart and not risk someone forgetting to close doors etc. then I wouldn't recommend it. Even with that it's difficult during the few days when she's at the peak of her season and smelling most attractive. I have sent Ro to stay with a friend at this stage a few times which makes life easier for all of us. I'm very lucky with Ro though, despite him being a stud dog for Hearing Dogs and knowing what it's all about he's very good and doesn't whinge at all or mither after Caoimhe too much. He gets a bit more wound up when she's at the peak time but tbh Caoimhe's worse than him, she's a bit of a floozy, and that's why I try to send him to my friend's house if I can! If he was the kind of dog who whined, howled, scratched at the doors, cocked his leg indoors, went off food etc. it'd be unbearable. I have a system for keeping them apart - up to and then after her peak time I can have them in the same room if I'm there as Ro really isn't that bothered as he knows not to waste his time if they're not ready. He is unusual though, most other male dogs I know aren't like this! I never leave them unattended right from day 1 though, just in case. If I go to the shower/loo/bed Caoimhe comes with me, and when I'm out they are locked in opposite sides of the house - I have a longish hallway and two locking doors between my kitchen and living room so I know there's no way they can get to each other. Caoimhe is nearly 6 now and we've never come close to having an accident, but it is hard work for those 5 or 6 days in the middle and fairly stressful; even though I'm fanatical about closing and locking the doors - I tape a reminder note to the inside of my front door for the duration which I can't miss - I still get the odd 'oh my god I did didn't I??!!' moment when I've left the house!