At  the Dog Shows a judge familiar with a specific dog breed evaluates individual purebred dogs for how well the dogs conform to the established breed type for their breed, as described in a breed's individual breed standard. A Dog show is not a comparison of one dog to another but a comparison of each dog to a judge's mental image of the ideal breed type as outlined in the individual breeds breed standard. Dog show judges attempt to identify dogs who epitomize the published standards for each breed. This can be challenging, because some judgments must necessarily be subjective. As an 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. Judges are generally certified to judge one or several breeds, usually in the same Group but a few "All-Breed" judges, have the training and experience to judge large numbers of breeds.

Exhibitions dogs play an important role in the selection of the most valuable specimens. Granted assessment to decide whether dog or bitch can be used in future reproduction. Another role of the exhibition is to exchange experiences between the breeders, learning about the breeds, as well as the social gathering of people with similar interests.

The most important title on the Show are:

• BIS  - Best in Show
• BOG - Best of Group 
• BOB  - Best of Breed