The Otterhound is an old British dog breed. The origins are not known. It is a scent hound and is currently recognised by the Kennel Club as a Vulnerable Native Breed... Source: https://en.wikipedia.org/wiki/Otterhound
It is estimated there are approximately 850 - 900 Otterhounds in the world today. The registration figures worldwide can be found in the Otterhound Database located on the US Otterhound Club website as they are supplied with official registrations from around the world.
There are numerous breed standards. The basis of breed/conformation shows is the judging of pedigree dogs against the 'Breed Standard', which is a picture in words that describes the range of features that are deemed appropriate for the breed.