deafness in dogs causes
Certain medications can also cause deafness in dogs. For example, some antibiotics such as Gentamicin, Neomycin, Streptomycin, and Kanamycin can cause nerve damage resulting in hearing loss.
High doses and/or lengthy treatments with these antibiotics should be avoided. In the authors' experience, the most common cause of acquired deafness in dogs is simply the result of untreated otitis externa and otitis interna. Mild ear infections left untreated always have the potential to cause hearing impairment.