Am I being unreasonable?

So, I booked this sitter for about 20 nights since I was traveling out of the country. We did a meet and greet which went fine and they decided they were a good fit to board my high energy dog (1.5 years old).

I provided his own crate (he is crate trained) and told them to not leave the dog alone unsupervised. I provided his typical day to day schedule/walking times etc.

First day boarding the dog: no updates from the sitter

Third day: complain that the dog chewed their ottoman. I asked them to not leave the dog alone and even provided his own crate, which should be used if my dog would need to be left unsupervised. They also mentioned that this happened when they were at the kitchen making breakfast. No updates besides this. No pictures, not telling how the dog is doing, if eating well etc. because it was so early on the booking I didn’t want to create a bad environment I mentioned I’d figure out how to get the ottoman repaired once I’m back.

Day 4: complain that the dog has very high separation anxiety and that they cannot leave him alone for 5 minutes. I asked for updates and received 1 picture.

Day 5: complain that the dog destroyed the seat of their couch. They started asking for damage fees. Again, I said I’d figure it out once I’m back from vacation what could be done and that I’d support a solution. I didn’t want to risk them mistreating my dog due to the issues.

Day 6: 2 pictures in the morning. I told them I’d get some calming treats delivered to calm the dog down (I never had to do this before)

Day 7: informed me the dog destroyed two shoes.

Day 8: informed me that the dog destroyed another part of the couch.

At this point, from out of the country, I had to call and arrange him to be transferred to a boarding facility. The sitters were more than happy to drive him as soon as I mentioned that.

I had to pay $200 mid booking to cancel the remaining of the stay and thought this would be the end of it.

I’m back from vacation and now the sitter has been harassing me asking for $800 in damages fees. Yes I had said I’d figure out how to help. However they started harassing me on all social media and even threatened to come to my work to collect a check. I incurred costs on international phone calls, $200 cancellation fee and $600 additional boarding costs.

Am I the asshole for disagreeing to pay?

UPDATE:

The sitter mentioned verbally on day 1 that the couch was “a very very old couch that only the dogs used to use”. Considering this statement, I counter offered saying that the current value of the couch would be around $300, which you can find similar brand new couches on Walmart, target, and even wayfair. They do not have the original receipt of the value and they didn’t informed me when they made the purchase. I mentioned that I’d meet him 50% of the face value and pay them $150 for the damages. I also offered that considering it was an old couch they could go ahead and look on Facebook marketplace if they see fit and I’d arrange to have a couch transported to their home.

I declined to pay for the shoes considering that I did not receive a picture of the damages and it happened after me informing them to not let the dog unsupervised twice.

They called me names, questioned my integrity, said that they don’t buy second hand stuff nor low quality items, which I have all in written on the Rover app.

They are threatening to go to small court claims. I doubt it will happen, if it does happen I’m glad I have all documented.

For new members of the Rover app: think twice before you book a sitter and avoid the headaches.