Congenital vs Acquired Deafness in Dogs

Pets born deaf generally adapt more smoothly than those who lose hearing later. They have no auditory habits to unlearn, no startled reaction to a world that was once full of sound and is now silent. Training can begin immediately with visual signals, and these animals often develop sharper awareness of movement, vibration, and body language.

Pets that lose hearing after months or years of normal auditory function face a harder adjustment. They may ignore commands they once followed — not out of stubbornness, but because they can no longer hear them. Owners sometimes mistake early acquired hearing loss for disobedience or cognitive decline, which can delay diagnosis.

Recognizing that these two types require different management approaches is the first step toward helping a deaf pet thrive.

Genetic Risk and Congenital Deafness

Genetics is the primary driver of congenital deafness in both dogs and cats. Certain coat-color genes that produce white fur, blue eyes, or merle patterns also interfere with the development of pigment-producing cells (melanocytes) in the inner ear. Without those cells, the cochlear structures needed for hearing do not form properly.

In cats:

• White cats carrying the dominant W gene have a significantly elevated deafness rate compared to cats of other colors.
• White cats with two blue eyes face a deafness risk estimated at 60–80%.
• White cats with one blue eye have a lower but still elevated risk, and the deaf ear is typically on the same side as the blue eye.

In dogs:

• Dalmatians are the most widely recognized high-risk breed. Roughly 30% are deaf in at least one ear, and about 5% are bilaterally deaf.
• Other breeds with recognized inherited risk include English Setters, Australian Shepherds, Bull Terriers, Border Collies, Boxers, and Great Danes.
• Any breed carrying piebald or merle coat patterns has elevated risk. The merle gene and extreme white spotting genes disrupt melanocyte migration to the cochlea.

Beyond the breeds listed above, the Dogo Argentino is another breed where congenital deafness occurs at a notable rate. Responsible breeders of high-risk breeds use BAER testing to screen litters and make informed breeding decisions, which helps reduce the prevalence over generations.

If you are adopting or purchasing a puppy from a breed with known deafness risk, ask the breeder whether the litter has been BAER-tested. Early identification allows you to begin visual-signal training right away and set up a safe living environment before problems arise.

Causes of Acquired Hearing Loss

Acquired deafness in dogs and cats has several common causes, ranging from gradual age-related decline to sudden toxic damage.

Age-related hearing loss (presbycusis). This is the most common form of acquired deafness. The auditory system deteriorates over time, much as it does in humans. High-frequency sounds are typically lost first, followed by a broader decline across all frequencies. Because it is gradual, many owners do not notice early signs — the dog still reacts to loud noises but misses softer cues like a quiet call or a doorbell from another room.

Chronic ear infections. Recurring otitis media (middle ear infection) or otitis interna (inner ear infection) that is undertreated or left untreated can permanently damage the structures responsible for transmitting and processing sound. Dogs with floppy ears, such as Cocker Spaniels and Basset Hounds, are especially prone to chronic ear infections.

Ototoxic medications. Certain drugs are known to damage hearing:

• Aminoglycoside antibiotics (e.g., gentamicin, amikacin)
• Some loop diuretics (e.g., furosemide at high doses)
• Certain chemotherapy agents (e.g., cisplatin)

These medications can cause irreversible hearing damage, particularly with prolonged use or high doses. Always discuss potential side effects with your veterinarian when these drugs are prescribed.

Other causes include head trauma, severe or prolonged noise exposure, and tumors affecting the ear canal or auditory nerve.

Yes. Chronic or severe ear infections can cause permanent structural damage if they reach the middle or inner ear. Similarly, ear drops containing ototoxic ingredients — or medications applied to a ruptured eardrum — can damage the cochlea directly.

If your dog has a history of recurrent ear infections, discuss hearing monitoring with your veterinarian. Prompt and complete treatment of ear disease is one of the most effective ways to prevent acquired deafness.

Testing and Living With a Deaf Dog

Home observation. You can perform a basic screen at home by clapping, jangling keys, or calling your pet's name from behind — where they cannot see you. A pet with normal hearing will turn toward the sound. However, some pets compensate for hearing loss by detecting vibrations through the floor or changes in air currents, so a lack of response at home is not conclusive.

Unilateral vs. bilateral deafness. Unilateral deafness (one ear affected) is harder to detect because the pet still hears from the functional ear. These pets may have difficulty localizing sounds — they might look the wrong direction when called. Bilateral deafness (both ears) is easier to identify because the pet shows no response to any sound.

Interestingly, many bilaterally deaf pets adapt better than those with unilateral loss because they are not confused by asymmetric input. For unilaterally deaf pets, approach and call from the hearing side to avoid startling them.

The Brainstem Auditory Evoked Response (BAER) test is the gold standard for diagnosing hearing status in dogs and cats. It is non-invasive, painless, and can be performed on puppies as young as six weeks old.

How it works:

1. Small electrodes are placed on the pet's head.
2. A series of clicks or tones are played into each ear individually.
3. The electrodes measure the brainstem's electrical response to the sounds.
4. The test distinguishes between normal hearing, partial hearing loss, and complete deafness in each ear independently.

BAER testing is especially recommended for puppies and kittens of high-risk breeds. Early identification allows training to begin with hand signals from the start, rather than attempting to transition later.

Living with a deaf pet — practical tips:

• Use hand signals consistently. Pick clear, distinct gestures for sit, stay, come, and other commands. The entire household should use the same signals.
• Get their attention visually. Stomp on the floor (they feel the vibration), wave your hand in their line of sight, or flick a light on and off.
• Keep them leashed or in enclosed areas outdoors. A deaf pet cannot hear traffic, other animals, or your recall command.
• Add an ID tag that says "I am deaf." This alerts anyone who finds your pet if they wander.
• Avoid startling them. Approach from where they can see you. If they are sleeping, touch them gently on the shoulder rather than grabbing or shouting.
• Be patient during the transition. Pets with acquired deafness need time to learn new communication methods. Reward visual attention generously with treats and praise.

With understanding, consistent training, and appropriate safety precautions, deaf pets live full, happy lives. The adjustment period is real, but the bond between a deaf pet and an attentive owner can be just as deep — and sometimes even stronger — than one built on verbal communication.

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Medical Disclaimer: This article is for informational purposes only and does not replace professional veterinary advice. If you suspect your pet has hearing loss, consult a licensed veterinarian for proper evaluation and guidance.

Sources

1. Deafness in Dogs — Merck Veterinary Manual
2. Congenital Deafness and Its Recognition — LSU School of Veterinary Medicine
3. Living with a Deaf Dog — VCA Animal Hospitals