No reason was stated for the recall, so it could be through product testing either by the company or by another entity.
https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts/j-m-smucker-co-issues-limited-voluntary-recall-two-lots-meow-mixr-original-choice-dry-cat-food
The J. M. Smucker Co. Issues Limited, Voluntary Recall of Two Lots of Meow Mix® Original Choice Dry Cat Food for Potential Salmonella Contamination
Summary
Company Announcement Date: April 09, 2021
FDA Publish Date: April 12, 2021
Product Type: Animal & Veterinary Pet Food
Reason for Announcement: Potential Salmonella Contamination
Company Name: J. M. Smucker Co.
Brand Name: Meow Mix®
Product Description: Meow Mix® Original Choice Dry Cat Food
https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts/j-m-smucker-co-issues-limited-voluntary-recall-two-lots-meow-mixr-original-choice-dry-cat-food
The J. M. Smucker Co. Issues Limited, Voluntary Recall of Two Lots of Meow Mix® Original Choice Dry Cat Food for Potential Salmonella Contamination
Summary
Company Announcement Date: April 09, 2021
FDA Publish Date: April 12, 2021
Product Type: Animal & Veterinary Pet Food
Reason for Announcement: Potential Salmonella Contamination
Company Name: J. M. Smucker Co.
Brand Name: Meow Mix®
Product Description: Meow Mix® Original Choice Dry Cat Food