[1] It contains concise, thorough information on the diagnosis and treatment of disease in a wide variety of species.

[3] Additionally, the full text can be accessed for free via the website, or downloaded in its entirety via an app.

[5] Interactive features on the website include quizzes, case studies, and clinical calculators.

[1] It was based on the Merck Manual of Diagnosis and Therapy, which was first published in 1899 as a reference for physicians.

[11] In 2018, a free app version was made available which included a 57 megabyte download of all the information from the eleventh edition.