Brandis, Katja 7z -

Carag, the cougar-shifter, returns as the lead character.

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. Brandis, Katja 7z

Brandis has built an extensive world through several interconnected series: Carag, the cougar-shifter, returns as the lead character

Carag's Transformation (The Woodwalkers Book 1) - Amazon.com shapeshifter fantasy series

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).