The 55c stamp was issued in 2009 celebrating European Dog Show in Dublin.
A dog show is not a comparison of one dog to another. It is a comparison of each dog to a judge's mental image of the ideal breed type as outlined in the individual breed's breed standard. A judge chooses the dog(s) that most closely resemble the ideal on that particular day.
Dog show judges attempt to identify dogs who epitomize the published standards for each breed. This can be challenging, because some judgements must necessarily be subjective. For example, what exactly entails a "full coat" or a "cheerful attitude", descriptions found in breed standards, can only be learned through experience with the breed that has that particular requirement.