Hearing loss in dogs has several distinct causes, ranging from genetics present at birth to gradual age-related decline. Some causes are preventable, others are not, but recognizing what’s behind your dog’s hearing loss can help you respond appropriately and adapt your training and communication.
Congenital Deafness and Genetics
Some dogs are born deaf or lose their hearing within the first few weeks of life. This type of hearing loss is almost always linked to coat color genetics, specifically genes that control white pigmentation. Two genetic regions drive most congenital deafness in dogs: the piebald locus on chromosome 20 and the merle locus on chromosome 10. Both influence how pigment-producing cells develop throughout the body, including inside the ear.
The connection between pigment and hearing isn’t obvious, but it comes down to a structure deep in the inner ear called the stria vascularis. This structure contains pigment cells that don’t actually produce color. Instead, they help regulate the chemical environment the ear needs to convert sound into nerve signals. When a dog’s genetics prevent those pigment cells from developing properly, the stria vascularis never forms correctly. The cochlear duct collapses, and the nerve cells that carry sound to the brain degenerate shortly after birth.
Breeds with heavy white patterning are most commonly affected. Dalmatians, Australian Cattle Dogs, and English Setters all have well-documented rates of congenital deafness. In Australian Cattle Dogs, roughly 11% are born with some degree of hearing loss, with about 7.5% deaf in one ear and 3.3% deaf in both. A U.S. study found even higher rates at 14.5%. Dogs with more pigmentation on their faces and bodies have significantly lower rates. Australian Cattle Dogs with pigmented body spots had a deafness prevalence of just 4.8%, compared to 12.8% in dogs without those spots. Females also appear slightly more susceptible than males (13.2% versus 8.9%).
Interestingly, while researchers know that white pigmentation genes are involved, genome-wide association studies have not pinpointed a single straightforward genetic marker. Different breeds show associations on different chromosomes, and none of the significant findings have mapped directly to the known pigment gene. The genetics are more complex than a single inherited trait.
Age-Related Hearing Loss
Just like in humans, older dogs gradually lose their hearing. This process, called presbycusis, involves four types of physical change inside the ear: loss of nerve cells in the spiral ganglion (the bundle of neurons connecting the ear to the brain), deterioration of the organ of Corti (the structure that detects sound vibrations), shrinkage of the stria vascularis, and thickening of the basilar membrane. All four changes were present in dogs over 12 years old in histological studies, and they were most pronounced at the base of the cochlea, which is the region responsible for detecting high-pitched sounds. This is why older dogs typically lose the ability to hear high frequencies first.
The damage isn’t limited to the ear itself. Dogs over 10 showed nerve cell loss and other degenerative changes in the brainstem regions that process sound. This means age-related hearing loss involves both the sensory equipment and the brain’s ability to interpret what it receives. The progression is gradual, which is why many owners initially mistake it for stubbornness or inattention rather than a physical change.
Chronic Ear Infections
Ear infections are one of the most common reasons dogs visit the vet, and when they become chronic, they can cause lasting hearing damage. The progression typically starts with otitis externa, an infection of the outer ear canal. Over time, chronic inflammation triggers a cascade of structural changes: the glands in the ear canal enlarge and dilate, the skin lining the canal thickens, and eventually fibrosis, narrowing, and even calcification set in. The canal literally hardens and closes down.
If the infection reaches the middle ear, the stakes rise considerably. Otitis media develops as an extension of outer ear disease in up to 50% of chronic cases, and middle ear infections are associated with significantly more hearing loss than outer ear infections alone. Once infection settles in the tympanic bulla (the bony chamber of the middle ear), it also acts as a reservoir that fuels recurring external infections, creating a cycle that’s difficult to break without aggressive treatment.
Ototoxic Medications
Certain medications can damage the structures of the inner ear, causing partial or complete hearing loss. The drugs most commonly implicated in veterinary practice are aminoglycoside antibiotics (gentamicin, amikacin, streptomycin, and neomycin), the chemotherapy agent cisplatin, and loop diuretics like furosemide. Some less commonly used drugs, including erythromycin and the heartworm treatment melarsomine, also carry ototoxic potential.
What makes this particularly relevant for dog owners is that aminoglycosides are used not only as injectable antibiotics for serious infections but also as topical treatments applied directly into the ear canal. If the eardrum is ruptured, which is common in dogs with chronic ear infections, topical medications can pass through into the middle and inner ear where they cause direct damage. The risk also increases when ototoxic drugs are combined. Loop diuretics given alongside aminoglycosides can amplify the hearing damage beyond what either drug would cause alone.
Noise Exposure and Trauma
Dogs can suffer noise-induced hearing loss, though it’s documented far less often than other causes. Working dogs are most at risk. A case series of three working dogs diagnosed with noise-induced hearing loss after loud noise exposure confirmed bilateral sensorineural deafness on testing. One of the three dogs never regained hearing and was transitioned to hand signal commands. Another recovered hearing after two months of antioxidant supplementation. The outcomes varied widely, highlighting that noise damage can be either temporary or permanent depending on severity.
Physical trauma to the head or ear, as well as tumors affecting the ear canal, middle ear, or auditory nerve, can also impair hearing. These causes are less common but worth considering if hearing loss develops suddenly or in only one ear.
How to Recognize Hearing Loss
The behavioral signs of hearing loss are subtle at first, especially when only one ear is affected. You may notice your dog failing to come when called, not responding to familiar verbal cues, or seeming to ignore you when you enter a room. Dogs with hearing loss often sleep more deeply and are harder to wake. Some dogs startle more easily when touched unexpectedly, since they didn’t hear you approach. Excessive barking can also develop, as the dog can no longer modulate its voice based on auditory feedback.
The gold standard for diagnosing hearing loss is the BAER test (brainstem auditory evoked response). During this test, small needle electrodes are placed under the skin at the top of the head and near each ear. Clicks are played into one ear at a time while the electrodes record the electrical activity traveling from the ear through the brainstem. The computer averages hundreds of responses to produce a waveform. In a hearing dog, each ear produces a symmetrical tracing with four to six distinct peaks, each representing a different stage of the auditory pathway. A flat or absent tracing confirms deafness in that ear. The test is quick, requires no sedation in most dogs, and can distinguish between partial and complete hearing loss, as well as unilateral and bilateral deafness. It should be performed by a veterinary neurologist or a clinician with specialized training in electrophysiology.
Living With a Deaf Dog
Dogs that lose their hearing, whether from birth or later in life, adapt remarkably well. Training shifts from voice commands to hand signals, and most dogs pick these up quickly since they already watch your body language closely. The core principle is the same as with any dog: pair a signal with a reward until the dog reliably responds.
Vibrating collars (not shock collars) can serve as a useful tool, particularly off-leash. The vibration functions like calling your dog’s name. It gets their attention so they look at you, and then you deliver a hand signal. It’s important to introduce the vibration gradually, starting by holding the collar against your dog’s body rather than their neck, especially if the dog has an unknown history that might include shock collar training. Teach a solid “watch me” response and recall command with hand signals before adding the collar to your routine.
Safety is the biggest practical concern. A deaf dog that gets loose cannot hear you call them back, and traffic, wildlife, or other hazards become more dangerous when the dog can’t hear them coming. Secure fencing, leash walking near roads, and reliable visual recall training are essential. Many owners also find that stomping on the floor or flicking a porch light works well to get their dog’s attention indoors, since deaf dogs become highly attuned to vibrations and visual changes in their environment.