J

JACK: Male donkey or ass. Mammoth jack is a large breed of asses.
JAMMED HEEL: One heel appears to be jammed up into the foot, with its bulb and coronary band correspondingly distorted.
JAR: Extra sharp calks.
JENNY OR JENNET: Female donkey or ass.
JHU: See: IUJH.
JOURNEYMAN: [French journee, a day's work. From the Latin diurnus, daily]: A person who has completed an apprenticeship and is free to sell his labor to the master of any shop willing to hire him. Due to the mobile, independent nature of the modern horseshoer, the traditional journeyman farrier is rare today. See also: CJF.
JUNIATA: Brand of horseshoes. Handmade from 1824 to 1859, then machine made until 1925.