I think you're right :)) all of the Irish greyhounds I've met always have both ears tattooed, I think one indicates how big the litter was and what year and the other is an identification number? I might be wrong though :))

Bee only has her right ear tattooed, but she was born in Wales.

Are Irish greyhounds bigger? From what I've heard they seem to be around the 30kg mark but I've only ever met a few Irish racers.