The Mediaeval Journal, Vol. 11, Issue. 1, p. 169. The livery collar had a pervasive presence in late-medieval England. Worn about the neck to denote service to a lord, references to the collar abound ...
The most common restraint collar is the Elizabethan collar (or e-collar). Many different manufacturers sell e-collars and modified e-collars designed for different species and for specific purposes.