The Broom-Squire by Sabine Baring-Gould

Jonas found that old Clutch was not lavishing endearments on the gray mare over the intervening partition of stalls, but was lying down on the straw. Nothing said or done would induce the horse to rise, and the hostler told Bideabout that he believed the beast was really lame. It had been overworked at its advanced age, and must be afforded rest.

"He's a Radical," said the Broom-Squire. "You move that gray into another stable and Clutch will forget about his lameness, I dare swear. He's twenty-five and has a liquorish eye, still -- it's shameful."