I personally haven't. But I've had people and couples come over to play and they've brought their dog as well. Let the dogs get to know each other for a little bit first. We've always kept them separate during events. So if one was mounting the other would be in a different room. And then swap them out. I'm sure if you had a couple dogs who were used to each other you could probably come up with a system that kept them from being aggressive. But I can't speak with any certainty to that.