Following a recommendation from the Dog Health Group, the General Committee has agreed that, with effect from 1st January 2013, the Kennel Club will no longer accept the registration of any puppies for any breed that are produced as a result of mating two merle (dapple) coloured parents together.
 
The merle mutation is a dominant mutation that causes the characteristic merle or dapple colour pattern in a number of breeds. It is also known that there can be associated health risks in those dogs that have the merle mutation.
 
Many breeds have lived with the merle gene in their population and have avoided merle to merle matings for many years. Some breeds have successfully requested formal banning of such matings and the Kennel Club will not now accept any litter for registration where both parents are merle for Shetland Sheepdogs, Dachshunds (all varieties) and Beaucerons (although these are called tricolour).
 
In the breeds where merle is proven to not occur naturally, the Kennel Club will not register any dogs that are merle coloured – these include Chihuahuas (Long and Smooth), Staffordshire Bull Terriers, Bull Terriers and Bull Terriers (Miniature). In addition, the Kennel Club will not register litters from Chihuahuas where one parent is merle coloured.
 
Merle patterning, patches of lighter colour appearing in the coat, is the result of the M gene in the dog. There are two alleles of this gene: MM (merle) and M+ (non-merle), with merle (MM) being dominant to non-merle (M+). In some breeds, the effect of the merle allele (MM) is termed ‘dapple’.
 
Unfortunately, the effects of the merle allele (MM) are not confined to coat patterning and we know that there can be an increased risk of impaired hearing and sight associated with it, particularly in dogs that are homozygous for MM (dogs that carry two copies of the MM allele).
 
Due to the associated health concerns, it is not believed that serious breeders would intentionally mate a merle to merle but the commencement of this restriction in January 2013 allows breeders time to readjust any planned breeding programmes.
 
ENDS
[156.12]
18th May 2012
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Notes to Editors:
 
Dog Health Group
 
The Kennel Club’s Dog Health Group was established in January 2010, to replace and expand the remit of the Breed Health and Welfare Strategy Group which was established in 2002. The Group (and its forerunners) has been in existence since 2002 and has three subgroups, whose members include a wide range of experts including breed experts and the most eminent human and dog geneticists in the country, concentrating on Genetics and Health Screening, Breed Standards and the KC Assured Breeder Scheme, respectively.
 
The Kennel Club is the largest organisation in the UK devoted to dog health, welfare and training. Its objective is to ensure that dogs live healthy, happy lives with responsible owners.

It runs the country’s largest registration database for both pedigree and crossbreed dogs and the Petlog database, which is the UK’s largest reunification service for microchipped animals. The Kennel Club Assured Breeder Scheme is the only scheme in the UK that monitors and sets standards for breeders, in order to protect the welfare of puppies and breeding bitches. It also runs the UK’s largest dog training programme, the Good Citizen Dog Training Scheme and licenses shows and clubs across a wide range of activities, which help dog owners to bond and enjoy life with their dogs. The Kennel Club runs the world’s greatest dog show, Crufts, and the Discover Dogs event at Earls Court, London, which is a fun family day out that educates people about how to buy responsibly and care for their dog.
 
The Kennel Club invests the money that it makes from registrations and its Petlog identification database into its dog training and education programmes, welfare campaigns and the Kennel Club Charitable Trust, which supports dog welfare charities and research into dog diseases. The Kennel Club jointly runs health screening schemes with the British Veterinary Association and, through the Charitable Trust, funds the Kennel Club Genetics Centre at the Animal Health Trust, which is at the forefront of pioneering research into dog health.
 

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