@Kristie75 what a horrible experience and completely irresponsible host! I’m so sorry and I hope your pup makes a full recovery. In your shoes I would:
Cancel the reservation and move out immediately, if you haven’t already.
Call Airbnb to report a safety issue with your stay.
Document the event with photos and receipts.
File a claim for your expenses with Airbnb’s resolution center (“send/request money”) and involve Airbnb if the host doesn’t pay.
Leave a complete review, with just the facts of the events of your stay. Don’t include speculation or facts not directly relevant to your stay so the host can’t get it removed.
Report the listing and the host (see little flag icons where you can do this).
This listing needs to come down before an innocent animal is killed.