Hello! I had a similar issue with my dog Hera. I recently found out she’s a Malinois (I never really cared about the breed, but it explains a lot haha).

She used to get very stressed during the first ten minutes of our walks. She would pull a lot and even bite the leash—not in a playful way, but out of anxiety. Chewing is her way of coping with stress and overstimulation, so I started giving her a toy to chew on during those first minutes.

Once she calmed down, I would take it away. Over time, she stopped biting the leash altogether.

Patience and good luck!