@Erin5648 Congratulations on your successful divorce. I can't tell from your post what kind of a refund you're pursuing here. If you decided that you no longer want to stay with this host, and just want to cancel the remainder of the reservation, you can send your host a Booking Change request and ask that the unused booked nights be refunded. That would of course be conditional upon you vacating the home.
If you're looking to make a claim for medical expenses due to the dog bite, you'd have to go through the Host Protection procedure (now it might be rebranded as "Air Cover") since that's a liability insurance issue.
Presumably you're not expecting nights you've already stayed to be retroactively refunded, because that would be ridiculous.