Have you ever met a dog with one blue eye and one brown eye—or an eye that contains two different colors? This striking appearance is known as heterochromia in dogs.
Heterochromia occurs when there is a difference in pigmentation between a dog’s eyes or within different areas of the same iris. It can be especially noticeable in breeds such as the Siberian Husky and Australian Shepherd.
Those mismatched eyes can certainly be beautiful, but they also raise some common questions: Why does heterochromia happen? Does it affect a dog’s vision? And when should a change in eye color be checked by a veterinarian?
What Is Heterochromia in Dogs?
Heterochromia describes a difference in coloration of the iris—the colored portion of the eye.
Eye color is influenced by pigmentation, including the amount and distribution of melanin within the iris. Differences in pigmentation can result in one eye appearing a different color from the other or in multiple colors appearing within a single eye.
In dogs, the most recognizable example is:
However, heterochromia can appear in several different ways.
What Are the Types of Heterochromia in Dogs?
Heterochromia is generally described according to how the different colors appear in the eyes.
Complete Heterochromia
Each eye is a distinctly different color. A common example is a dog with one blue eye and one brown eye.
Sectoral Heterochromia
Also called partial heterochromia, this occurs when different colors appear within the same iris, such as an eye that is primarily brown with a blue section.
What Causes Heterochromia in Dogs?
There isn’t one single cause. The most important distinction is whether the unusual eye coloration has been present since the dog was young or appeared later in life.
🧬 Inherited Pigmentation
Many dogs with heterochromia are simply born with different pigmentation in their eyes.
Genetics influencing coat color, markings, and pigmentation can also influence eye color, which is why heterochromia appears more frequently in certain breeds and color patterns.
👁️ Acquired Changes
A dog’s eye can sometimes change appearance later because of trauma, inflammation, disease, or another problem involving the eye.
This is different from a dog simply being born with two differently colored eyes.
What Dog Breeds Can Have Different-Colored Eyes?
Heterochromia can occur in different dogs, but striking differences in eye color are particularly associated with certain breeds and pigmentation patterns.
Australian Shepherd
Siberian Husky
Dachshund
Border Collie
Great Dane
Shetland Sheepdog
The presence of heterochromia does not necessarily mean a dog is purebred or belongs to one of these breeds. Mixed-breed dogs can have differently colored eyes too.
For example, Australian Shepherds are particularly well known for their variety of coat, marking, tail, and eye characteristics. You can learn more in our guide to Australian Shepherd characteristics and tail variations.
Why Do Some Dogs Have One Blue Eye and One Brown Eye?
A blue-looking iris generally contains less pigmentation than a brown iris. When pigmentation develops differently between the two eyes, the result can be one blue eye and one brown eye.
That difference can look dramatic, but if the dog was born with it and the eyes are otherwise healthy, it may simply be part of the dog’s natural appearance.
Does Heterochromia Affect a Dog’s Vision?
Congenital heterochromia by itself does not necessarily mean that a dog has poor vision.
A dog can have two differently colored eyes and still see normally. Eye color and visual ability are not the same thing.
However, an unusual-looking eye should not automatically be assumed to be harmless if other symptoms are present.
Changes involving the eye deserve particular attention because many different conditions can affect how an eye looks.
When Should Different Eye Colors Be a Concern?
If your dog has always had one blue eye and one brown eye, and both eyes appear healthy, the difference may simply be inherited pigmentation.
A new change in eye color or appearance is different and should not be dismissed as ordinary heterochromia.
Contact your veterinarian if you notice:
- A sudden or progressive change in eye color
- Redness
- Cloudiness
- Swelling
- Discharge
- Squinting
- Repeated pawing or rubbing at the eye
- Visible discomfort or sensitivity
- An eye injury
- An apparent change in vision
Eye problems can sometimes progress quickly, so significant or sudden changes should be evaluated rather than waiting to see whether they disappear on their own.
If you’re interested in preparing for unexpected veterinary situations, read our guide to navigating pet medical emergencies.
Are Blue Eyes or Heterochromia Linked to Deafness?
This question comes up frequently because pigmentation, coat color, eye color, and congenital deafness can be genetically related in certain dogs.
However, having heterochromia does not automatically mean a dog is deaf.
Risk can depend on the dog’s genetics, breed, pigmentation pattern, and other factors. A dog’s eye color alone should not be used to determine whether the dog can hear normally.
Can a Puppy’s Eye Color Change as It Grows?
Yes. Puppies’ eyes can change in appearance as pigmentation develops during early life.
This means a young puppy’s initial eye color may not necessarily be its permanent adult eye color.
If you are choosing a puppy because of a particular eye color or unusual appearance, remember that physical characteristics should never be the primary reason for bringing a dog home.
Temperament, health, exercise requirements, training needs, grooming, adult size, and lifestyle compatibility will matter much more throughout the dog’s life.
Heterochromia and Responsible Dog Breeding
Unusual eye colors can make a dog especially appealing on social media, but appearance should never take priority over health and temperament when dogs are bred.
Responsible breeding should consider the health of the parents, inherited conditions relevant to the breed, temperament, physical structure, and the welfare of both the adult dogs and puppies.
Breeding specifically to maximize unusual physical traits without considering associated genetics can create unnecessary welfare concerns.
Learn more about the importance of responsible dog breeding.
Don’t Choose a Dog for Its Eye Color Alone
A dog with one blue eye and one brown eye can certainly be beautiful—but eye color tells you very little about whether that dog belongs in your home.
Before choosing any dog, consider temperament, energy level, size, training requirements, grooming, health, family compatibility, and your everyday lifestyle.
Heterochromia in Dogs FAQs
What is it called when a dog has two different-colored eyes?
The condition is called heterochromia. Complete heterochromia occurs when the two eyes are different colors, while sectoral or partial heterochromia occurs when more than one color appears within the same iris.
Is heterochromia rare in dogs?
It is less common than having two eyes of the same color, but it is a recognized trait in several breeds and can also occur in mixed-breed dogs.
Is heterochromia bad for dogs?
Congenital heterochromia can simply be a pigmentation difference and does not automatically indicate a health problem. A new change in eye color, however, should be discussed with a veterinarian.
Can dogs with heterochromia see normally?
Yes, many dogs with inherited heterochromia can have normal vision. Different eye colors alone do not establish that a dog has a visual impairment.
Does one blue eye mean a dog is deaf?
No. Certain pigmentation patterns can be associated with congenital deafness in some dogs, but one blue eye or heterochromia alone does not mean a dog is deaf.
Why did my dog’s eye suddenly change color?
A new eye-color change can have several possible causes and should not automatically be considered normal heterochromia. Contact your veterinarian, particularly if the change is accompanied by redness, cloudiness, discharge, squinting, discomfort, or an apparent vision problem.
The Bottom Line on Dogs With Different-Colored Eyes
Heterochromia is one of the many characteristics that make individual dogs visually distinctive. One blue eye and one brown eye—or multiple colors within a single eye—can simply result from differences in pigmentation.
When heterochromia has been present since a dog was young and the eyes are otherwise healthy, it may be nothing more than a fascinating inherited trait.
The important distinction is change. If an adult dog’s eye suddenly changes color or develops redness, cloudiness, discharge, discomfort, or other symptoms, contact your veterinarian.
And when choosing a dog, enjoy those beautiful eyes—but look beyond them. The dog’s personality, needs, health, and compatibility with your life are what ultimately matter most.
Look Beyond the Eyes. Find the Right Match.
A dog’s appearance may catch your attention, but compatibility is what matters over a lifetime together.
Download the Hands2Paws app and answer the lifestyle questionnaire to discover dog breeds — and rescue dogs — that better match your home, activity level, family, and daily routine.