Hi Sarah,
I know I am responding to your question late, but I had a similar experience over the holidays and wanted to share for the future.
I was boarding a dog that I knew fairly well. I have a dog as well and this dog would become overly aggressive with my dog and bit me quite badly when I tried to break up a dog fight. She was fine 90% of the time but I was not ok with the risk to my dog and to me.
I called Rover to ask if they could find another sitter. Because it was the holidays, they were unable to find anyone else but did reach out to me daily to check in and offered support and reimbursement of certain costs that I may have incurred (i.e. if I wanted to buy some extra treats or toys to try and calm the dog down). I am not confirming Rover's reimbursement policy here - I think this was just a nice offer because they could not find a replacement sitter. The team was great, even though they couldn't find anyone.
The owner in my situation was the same - she offered no solutions at first and was resistant to even working with Rover to find another sitter. After agreeing to keep the dog, she attacked my dog again and my dog had scratches and was bleeding. I contacted the owner back and said she had to figure out something. She quickly found a friend who took the dog.
Rover's team was with me throughout the whole process and followed up even after the dog was relocated.
I think it is important to always chat with Rover's team in these cases. Even if the dog ends up staying, it is important to have a history of the dog and owner's behaviour on record for future incidents. In some cases, Rover may decide that an owner and their pup are not a good fit for the platform.
I hope that you didn't have too much further trouble and your holidays weren't too stressful!
You have to declutter and "doggify" your house. Anything that is breakable put in a closed closet. Anything that can be peed or pooped on roll it up and put it away. For this dog what I might suggest is a very, very, very long walk. Feed him well, extra treats. and put on soothing music.