Flesh-eating screwworms are feasting on pets; 4 dogs and cat attacked this week

The U.S. Department of Agriculture identified 74 animal cases of screwworm infestation in the United States since June 2025, when the parasitic fly was first detected in the country. Four dogs and one cat were attacked this week, according to the USDA report. Screwworms are parasitic fly larvae that feed on living tissue in open wounds of warm-blooded animals.

• Ars Technica — Flesh-eating screwworms are feasting on pets; 4 dogs and cat attacked this week

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