What's the Name of That Book??? discussion

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Moon Chosen
SOLVED: Children's/YA
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SOLVED. YA Fantasy. Two groups of people that live in the woods. One group consists of people called “scratchers” and have to have a healer that harnesses sun power to heal them. The other group are people that live in trees and have dogs as companions.
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It’s a three book series but I remember a fourth book being written during the time and those people bonded with wales. One the books covers depicts I do believe a cat of some sort and fire. I read this book a handful of years ago. I think right before Covid. But I’m not sure if it was new then or not.
I’ve tried Google search with multiple different descriptions but to no avail.
Thanks!