My dog chewed my AirPod but I have warranty

Unless you got an AppleCare+ for Headphones plan with your AirPods, the one-year hardware warranty may not cover this type of damage and you may need to purchase a replacement AirPod.

Ref:

• Apple One (1) Year Limited Warranty – Accessory - For Apple and Beats Branded Products Only.
• Should you get AppleCare+ for your AirPods Pro? - iMore