Hearing is a complicated subject. Julia freeman is the Neurology Technician at the Animal Health Trust
and she has responsibility for the Hearing Test Clinic. In this video she explains about the different kinds of deafness that can affect dogs.
Hearing problems can be 'sensorineural': affecting any part of the nerve pathway, or 'conductive': caused by a physical blockage or something like a ruptured eardrum.
Sensorineural hearing problems can be either 'congenital': existing at birth or 'acquired': through accident, illness or simply old age.
Although sensorineural hearing problems can result in partial or complete deafness, congenital sensorineural problems mean complete deafness in the effected ear.
Hearing is described in these ways:
* Bilaterally normal hearing - good hearing in both ears
* Unilateral deafness - complete deafness in one ear
* Bilateral deafness - deaf in both ears
Julia tells us which breeds of dog are most susceptible to congenital deafness, why deafness can be difficult to detect and why knowing about the hearing status of a dog can be helpful.