You can have them out at the same time, just keep them a safe distance apart. Don't let them crawl all over each other.

I have the snakes and the geckos and the dogs out together all the time. I just make sure everyone is a safe distance away from each other and it works out fine. I don't let any of my reptiles "roam" around (supervised) if there is any other species able to roam free as well. So no snakes or geckos out cruising when the dogs are in the room.