If you are wondering, Lucy and Titus get along, they act a lot like Chester and Spike from the old Warner Brothers cartoons. Titus is Spike and Lucy is Chester, the second we walk in the door, Lucy is running around Titus and going insane. Titus growls and Lucy backs off. I let them outside, Titus is sniffing around and Lucy runs laps around Titus. It took Lucy about two hours to calm down.
I love watching them play out these rolls, it's good for Titus because he gets interaction with other dogs. For Lucy it wears her out a little bit, she has a lot of energy and this helps her be calmer at nights.