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"Deafness is often difficult to assess accurately, mainly because cats are not able to tell us when they have trouble hearing. Usually, it is their failure to obey commands or respond to familiar noises that first alert cat owners to a deafness problem."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Cats/Health/Deafness.aspx>