Guinevere could always be sort of a calm source for Nora, someone who cools her jets so to speak when she gets upset about something pertaining to the major conflict at hand.
And she could absolutely rub Ji the wrong way. I love welsh corgis, Nora on the other hand might think his form is pathetic and might joke about him being her pet. She's not vicious, but she can be obnoxious. He could expect her to throw sticks now and again and dish out the baby talk while encouraging him to fetch whenever their conversations go a way she's no longer interested in.
Nora might like him better than most humans, though I don't know if that would be because she gets to walk all over him or if it's because he could potentially change her mind about the entire human deal. Either way, any of those lines would be interesting, so it's entirely up to you which you'd like to pursue.