He stared at the sleek horse flecked with lather between his haunches and on his neck, where the harness rubbed, stared at Ivan the coachman sitting beside him, and remembered that he was expecting his brother,
Leo Tolstoy. Anna Karenina (Translated by Constance Garnett)
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The horses were dark with sweat and lathered under collar and britching.
John Steinbeck. East of Eden, p.138 (1952)
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They were going at it hard when the Captain came riding back, having lathered the mare good by loping her along the river for about twenty miles.