If the PetSupermarket.com coupon code isn't working, consider the following steps:
- Check the expiration date on the coupon.
- Ensure the code is entered correctly, without any extra spaces.
- Verify the coupon's applicability to the items in the cart.
- Confirm if the coupon is for online use or in-store only.
- Clear browser cookies and try again.
- Contact customer support for further assistance.