Harlan Sprague Dawley

Harlan Sprague Dawley was a premier global provider of laboratory animals and preclinical research services to the pharmaceutical, biotechnology, and academic sectors. The company was most famous for its production of standardized research models, including the ubiquitous Sprague Dawley rat, which became a foundational tool in biomedical research. Beyond animal models, Harlan offered a comprehensive suite of products and services, including specialized animal diets under the Teklad brand, laboratory bedding, and contract research services for toxicology and pharmacology. In 2015, the company merged with Huntingdon Life Sciences to form Envigo, which was subsequently acquired by Inotiv in 2021.