you walk into the Bitty Adoption Centre and start looking around in the glass boxes at the bitties inside

Levi looks up and peers out of his box, looking at you. You're looking at the wall of glass boxes opposite to where his is. He's been here for years now, so he's genuinely convinced you'll either walk right past him, stare and walk away, or laugh at him and walk off

The clerk approaches you and asks if you need any help with everything

Levi watches and sighs, looking down at the ground. A reason he was never chosen is he's usually very aggressive when someone calls him short or mocks him in anyway... No one bothers to take him in...