"Character moves to a new town, makes friends, but only with their pets because they are an introvert. Has to struggle with being social and interacting the humans so that they'll be able to visit and hang out with their pet friends."
Basically just take the base and build from it in anyway you want. At least for the theme, the actual story is a whole other beast with all kinds of things involved. Engaging characters, interesting twists, and as with any story pay attention to the pacing. If your bored reading one of your scene over, chances are your readers will probably be to. If it's a scene that is critical to the story, Redo it to make it more interesting for you and your readers to read, because chances are readers will either skip over or drop it if it feels like a chore to get through.