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A dominant white cat with blue eyes is said to be at high risk of being deaf. (Here the "dominant" refers to the white color gene, not behaviour.) In case of a white cat with odd eyes, the ear on the side with the blue eye may be deaf, though in some rare cases an odd-eyed cat can also be totally deaf.

My cat with Heterochromia iridum

That's one of the cats I have. Totally white fur, pink pads and ears, and odd eyes. I have tested her for hearing and it seems quite obvious that she can hear, but does she hear only with one ear or two? How would I test if she's deaf in the ear on the blue side?

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  • It appears from the link a physical exam would be unlikely to allow visualization of the physical impairment; "Deafness is caused by an absence of a cell layer in the inner ear" – James Jenkins Jan 28 '14 at 11:41
  • cats will adapt quite quickly but you can try making sound on one side and then the other and see the difference in how they react – ratchet freak Jan 28 '14 at 15:08
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    When the cat is relaxed but not sleeping. Try and snap your fingers lightly on the side you think he is deaf, at a reasonable distance like 1.5metres from the side of his head, while he is looking forward- You should be positioned behind him so he doesn't track your hand moving. Increase the snapping loudness and see which ear moves to detect the sound or if he turns his head, to find the source of noise. You should try this several times, because sometimes cats just ignore the sound when they are lazy. This works with many animals. That is a beautiful cat by the way :) – Piotr Kula Feb 27 '14 at 19:57
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You have a good reason to be concerned about deafness in your cat, according to International Cat Care, white cats with one blue eye have about 30-40% chance to have some amount of deafness.

In cats, inherited congenital (present from birth) deafness is seen almost exclusively in white coated individuals. The deafness is caused by degeneration of the auditory apparatus of the inner ear and may affect one ear (unilateral) or both ears (bilateral).

Dr. George Strain wrote on the subject on determining if an animal is deaf:

Behavioral testing has limited value; animal responses rapidly adapt even when hearing is present, stressed animals with intact hearing may fail to respond, and unilateral deafness cannot be detected. In unilaterally deaf animals, the only behavioral sign of deafness is a difficulty in localizing the source of a sound, and many animals adapt to that also.

Veterinary Clinics of North America: Small Animal Practice - Special Issue: Pediatrics - July, 1999. "Congenital Deafness and Its Recognition" George M. Strain, PhD

So, in other words, if you clap your hands and your cat looks around for the source of the sound instead of directly at you, then your cat may be unilaterally deaf. If the cat knows that you're the source of the sound (you're the only human in the room) then the cat will look at you anyway, and you won't know if that's because she can tell where the sound is coming from or if she's smart!

One way to be absolutely sure is to have a specialist perform a BAER test.

the BAER can be defined as the electrical response of the brain to a series of auditory stimuli.

The Animal Health Trust's page gives several examples and pictures of dogs and cats undergoing this test. This test is also performed on infants, since it does not require the subject's cooperation.

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  • Hmm, if the other ear really is deaf, testing the lack of directional hearing seems promising. – Esa Paulasto Jan 28 '14 at 20:26
  • @EsaPaulasto - I don't have any experience in trying this, but based on non-deaf cats I've had, you can try snapping near each ear on a few different occasions. If the ear flinches back, the cat hears through it (although a lack of flinching doesn't demonstrate deafness). Don't overdo it, though - I'm sure it greatly annoys the cats. – Bobson Feb 7 '14 at 19:27

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