According to the OP, the store clerk said they couldn't sell it. It was damaged merchandise.
Damaged merchandise goes into the dumpster, and you can find YouTubes of people dumpster diving pet store trash and coming up with LIVE animals. Yikes some places don't even care enough to put an animal down before throwing it away.
Regardless, the animal would probably have been disposed of somehow, w/o the OP's intervention. Let's not re-define common English words to fit a narrow agenda.
Well said.
I think the most viral of those videos was the baby iguana, but I've seen many more.