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  Brain Auditory Evoked Response (BAER), Auditory Brainstem Response (ABR) Testing  

Puppies of many breeds of dogs may be born with deafness of one or both ears (congenital deafness):

Akita, American-Canadian Shepherd, American Eskimo, American Staffordshire Terrier, Australian Cattle Dog, Australian Shepherd, Beagle, Bichon Frise, Border Collie, Borzoi, Boston Terrier, Boxer, Bulldog, Bull Terrier, Cardigan Welsh Corgi, Catahoula Leopard Dog, Cavalier King Charles Spaniel, Chihuahua, Chow Chow, Cocker Spaniel, Collie, Dalmatian, Dappled Dachshund, Doberman Pinscher, Dogo Argentino, English Bulldog, English Cocker Spaniel, English Setter, Foxhound, Fox Terrier, French Bulldog, German Shepherd, Great Dane, Great Pyrenees, Ibizan Hound, Italian Greyhound, Jack Russel Terrier, Kuvacz, Labrador Retriever, Maltese, Miniature Pinscher, Miniature Poodle, Mongrel, Norwegian Dunkerhound, Nova Scotia Duch Tolling Retriever, Old English Sheepdog, Papillon, Pit Bull Terrier, Pointer, Puli, Rhodesian Ridgeback, Rottweiler, Saint Bernard, Schnauzer, Scottish Terrier, Sealyham Terrier, Shetland Sheepdog, Shropshire Terrier, Siberian Husky, Soft Coated Wheaten Terrier, Springer Spaniel, Sussex Spaniel, Tibetan Spaniel, Tibetan Terrier, Toy Poodle, Walker American Foxhound, West Highland White Terrier, Whippet, Yorkshire Terrier.


  Causes of congenital deafness    

In dogs the merle and piebald genes have been associated with congenital deafness.

In cats deafness is associated with white hair color and studies indicate that white cats with a blue irises have a higher incidence of congenital deafness than white cats with non-blue irises.

For further information on deafness in dogs please visit Professor Strain’s website:

For further information on deafness in cats please visit Feline Advisory Bureau's website:


  About the BEAR Test    

Objective electrophysiological testing of hearing function has been performed on dogs and cats routinely since the 1980’ies. The BAER test evaluates the animals response to stimulation with loud sound. Sound is delivered directly into the ear-canal and the response to sound is “captured” with sophisticated equipment that shows the electrical response (cochlear and brain) (in milli volts). In some patients bone-conduction BAER may be used to differentiate between conductive vs cochlear dysfunction.The BAER test protocol approved by the Orthopaedic Foundation for Animals ( is used.


BAER test equipment Bio-Logic Navigator Pro Unit for BAER testing in dogs and cats  

Testing is available in:


Ølby Dyrehospital

Ølbycenter 12

4600 Køge

Tel: 70250202

Dog having BAER test - hearing test - performed under sedation - insert earphones and subdermal needles are used  

Please call the clinic ahead for booking of a BAER test.

Sedation is necessary in most animals.

Dogs must be at least 35 days old at the time of BAER testing.




  1. Strain GM: Congenital Deafness and Its Recognition. Veterinary Clinics of North America. 1999.