Table 1.

Types of peripheral hearing loss

Deafness type	Possible cause(s)	Frequency
Hereditary congenital sensorineural	White pigmentation gene (W)	Common
Hereditary congenital conductive	Not reported in cats	–
Hereditary late-onset sensorineural	Not reported in cats	–
Hereditary late-onset conductive	Not reported in cats	–
Acquired congenital sensorineural	Prenatal ototoxic drug exposure	Uncommon
Acquired congenital conductive	Cartilage defect, canal atresia	Uncommon
Acquired late-onset sensorineural	Otitis interna, drug toxicity, presbycusis, environmental noise	Moderate
Acquired late-onset conductive	Otitis externa/media, canal stenosis	Moderate