Carag's Transformation (The Woodwalkers Book 1) - Amazon.com
Das Vermächtnis der Wandler (The Legacy of the Shifters). Brandis, Katja 7z
Carag, the cougar-shifter, returns as the lead character. Carag's Transformation (The Woodwalkers Book 1) - Amazon
Katja Brandis (the pseudonym of German author Sylvia Englert) is best known for her high-stakes, shapeshifter fantasy series, which are popular with readers aged 10 and up. Her work typically follows young "walkers" who can transform between human and animal forms as they navigate secret boarding schools and environmental conflicts. Her work typically follows young "walkers" who can
Clearwater High, a secret boarding school for shapeshifters.
The "7z" in your request likely refers to the in her overarching walker universe, which is the first book of the sequel series: Woodwalkers: The Return (Season 2), Volume 1: Das Vermächtnis der Wandler (The Legacy of the Shifters).