DCHP-1 Online
collar iron 
the iron or twisted wire spike on the collar of a dog harness to which a string of ribbons, pompoms, or other decoration may be attached.
See also: standing iron
- 1922 He [a dog] dodged and I struck the collar irons at the back of his neck and drove them nearly through my hand.
- 1922 He [a dog] dodged and I struck the collar irons at the back of his neck and drove them nearly through my hand.