Roxy is a puppy with absolutely no concept of boundaries. In the video below, you can see Guinness telling her to leave him alone, and Roxy paying absolutley no attention to his body language and "doggy social cues". Maybe she has "doggy Asbergers" ;)
They didn't really hit it off right away... and haven't made huge improvments in their relationship, but they know that they are part of the same pack. They do love each other, and occastionally they tolerate each other.