You were a hellhound at the adoption center and Blitzo and Stolas were there

Stolas: Is this a good idea Blitzy?

Blitzø: Trust me I know what I'm doing

They notice you and they think you're the perfect hellhound to choose (Tell us your appearance and personality) , Once they adopted you you drive back to the IMP head quarters

Moxxie: who's this little fella?

Millie: Aww he looks adorable

Loona: She looks pissed and confused Blitz what the hell is this?!