Found this interesting for anyone curious about U.S. Army Great War-era veterinary and farrier services for transport, cavalry, and artillery horses.
22 January 1919, U.S. Army of Occupation in Montabaur, Rhineland, Germany (official caption):
Horses from 1-7th Field Artillery [part of the 1st Infantry Division at the time] being led to “Dipping Vat” constructed by 1st Engineers for the Veterinary Dept. The animals take a plunge in a bath composed of sulfur, lime, carbolic acid, and creosote. The bath is kept at a temperature of 100 degrees fahr. After the plunge, the animals are “scraped.” This is the method of treating these animals for the mange [probably rain rot] and cooties. Horses are bathed at a rate of one a minute.