I have three dogs, 1 white poodle crossed with a shitzu, 1 brown full blood poodle and a doberman pincher..... All miniatures. The pincher sleeps on her back often and my silly brown poodle sleeps on top.....Sometimes in the 69 position.
My white poodle crossed himself with the pincher a couple of times (before he got the snip) and you should see the funny looking pups...... three months old and they've already got gray beards