Dogs, like humans, can suffer from hearing loss or deafness. Hearing loss can be congenital, temporary or permanent. Temporary hearing loss is usually caused by ear plugs from earwax, a foreign object or other problems of the external ear. Permanent hearing loss can be caused by trauma, disease or old age. If it is due to old age then it may belong to Cognitive Dysfunction Syndrome (CDS). There are also, of course, dogs that are congenitally deaf due to abnormalities of the auditory nerve, inner ear or brain.
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