@Geoff22 "If it was up to me I would evict them and take the hit on $$."
It is up to you.
I really don't think you need to have it in your house rules that guests shouldn't leave dogs unattended that bark continuously the entire time their owners are out, nor mention that they need to take the dog out for a walk often enough that it doesn't relieve itself on the carpet. That's just common decency and respect.
As Sandra, said, talk to them- they may not realize the dog barks when they are out. Not sure how to address the poop on the carpet issue- they obviously think that's just fine.
If they don't respond appropriately, tell them you'll have to cancel the rest of their stay.