English System
English dogs have a tattoo in one ear only, consisting of three letters and a number (eg. ABC 1) which refers to the number of puppies in the litter, or four letters (ABC A) if the litter contained more than eight puppies. The first letter indicates year of whelp...

Y, X = 1988   Z, A, B = 1989   D, E = 1990   H, I, J = 1991  
J, K, L = 1992   M, N = 1993   N, P, Q = 1994   Q, R = 1995  
R, S, T =1996   T, U = 1997   V = 1998

Irish System

Irish dogs have a three-letter tattoo in the left ear (eg. AAA) and a two-letter tattoo in the right ear (eg. BB). First letter in right ear indicates year of whelp...

E = 1985   H = 1986   I = 1987   J = 1988   K = 1989  
L = 1990   M = 1991   N = 1992   P = 1993   Q = 1994  
R = 1995   S = 1996   T = 1997   U = 1998   V = 1999  
X = 2000   Y = 2001

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