An exceptional, highly emotional, yet tough and demanding alpha personality like Rose will naturally clash with a strong alpha-male. It is easier for her to maintain a relationship with a puppy: a young, innocent, trustworthy person with intense feelings of love and loyalty towards her. Coming up with a plausible, though unlikely, story to bring two personalities at opposite extremes of the spectrum together was a real challenge, however, and required some real extreme measures such as the subplot with Natasha.