Roxie has just started humping Jackson (I think it's the weather bringing out all the crazy in those two!)
I know she's doing it out of dominance, both have been fixed, and it's only when they're playing.
Aside from being vigilant and telling her no every time she does it, is there anything else I can do? The whole time Jackson has been here we have treated Roxie as the alpha. She is fed first etc and naturally when you watch them she even goes through the door first. It's never been a problem because Jackson is a pushover. I think it's more when they're playing not that he is challenging her but she's just making sure he knows that she's top dog.