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# Comments Extended on Animal Drug Trial Design Notice
- URL: https://www.fdaweb.com/comments-extended-on-animal-drug-trial-design-notice/
- Published: 2018-08-20T12:00:00.000Z
- Updated: 2026-09-15T00:26:53.000Z
- Author: David McFarland
- Tags: FDA Policy/General, #legacy-id-D5142149

*Federal Register* notice: FDA has extended the comment period for a previous notice about study designs intended to generate data to support substantial evidence of effectiveness for investigational new animal drugs intended for preventing heartworm disease in dogs. To view the notice, click [here](https://www.gpo.gov/fdsys/pkg/FR-2018-08-20/pdf/2018-17858.pdf?ref=fdaweb.com).