Fortunately the Dalmatian and Australian Cattle Dog fanciers admit they have a problem
and test accordingly. However the breeders of most other breeds are in denial. According
to research conducted by Dr George Strain, Louisiana State University (LSU). There
are 99 other breeds of dog and 18 breeds of cats, Persian, Himalayan, Siamese and
Oriental and more are affected by congenital deafness.
Extract from Dr Strains article “Congenital Deafness”
The disorder is usually associated with pigmentation patterns, where the presence
of white in the hair coat increases the likelihood of deafness. Two pigmentation
genes in particular are often associated with deafness in dogs: the merle gene (seen
in the Collie, Shetland Sheepdog, Dappled Dachshund, Harlequin Great Dane, American
Foxhound, Old English Sheepdog, and Norwegian Dunkerhound among others) and the piebald
gene (Bull Terrier, Samoyed, Greyhound, Great Pyrenees, Sealyham Terrier, Beagle,
Bulldog, Dalmatian, English Setter).