Definition of "leashed"

In the registration for William, Earl of Dundonald, 1672-78, the same person, the boars' heads are armed and langued of the field, and the supporters are collared or and leashed gules.

1881, Robert Riddle Stodart, Scottish Arms: Being a Collection of Armorial Bearings, A.D. 1370-1678, Reproduced in Fascimile from Contemporary Manuscripts, page 59

[...] a sleuthhound proper, collared and leashed gules.

1895, Arthur Charles Fox-Davies, Armorial Families: A Complete Peerage, Baronetage, and Knightage, and a Directory of Some Gentlemen of Coat-armour, and Being the First Attempt to Show which Arms in Use at the Moment are Borne by Legal Authority, page 783

[...] on the dexter a greyhound proper collared and leashed gules, on the sinister an ostrich proper, in its beak a horse shoe azure.

1900, The Celtic Monthly: A Magazine for Highlanders, page 169

Supporters; Two greyhounds per fess argent and or, collared and leashed gules, suspended from the collar, a shield azure , charged with the Speaker's Mace in pale or; and each charged on the flank with a thistle proper.

1902, Lincoln's Inn (London, England), The Records of the Honorable Society of Lincoln's Inn, page 377