The shop clerk sputters a bit before launching into what sounds like a well-rehearsed patter about the quality of the merchandise they provide and that they stand behind what they sell and its effectiveness.

"I don't care if it's effective for people rattling bones around and using them for dice. I need cat. Not chicken, not rat, not whatever those are," she replies nodding after Snape has spoken and moving aside to make room for him to stand a little closer to whatever she's being shown. The man seems to know what he's talking about and he's not afraid to speak up.