Are Dogs Colourblind? What Dogs See and How to Choose Clearer Toys

By Dr Duncan Houston

A red ball may stand out vividly to you and be less distinctive against its background to your dog. That does not mean the ball is invisible, and it does not mean your dog sees the world only in black and white.

Dogs use colour differently from most people. The practical lesson is to consider the whole visual scene, including contrast, lighting, shape and movement, rather than choosing equipment by human colour preference alone.

Quick Answer

Dogs have colour vision, but their normal colour discrimination is more limited than that of most humans. Their two cone-pigment classes support dichromatic vision, often explained using blue-yellow distinctions rather than our usual red-green distinctions. Blue or yellow can be useful colours to try for toys, but visibility also depends on the background and lighting.

Why “colourblind” can be confusing

If someone uses colourblind to mean seeing only shades of grey, that is not an accurate description of normal dog vision. If they mean that dogs do not distinguish the same range of colours as a person with typical human colour vision, the comparison is more useful.

The retina contains light-sensitive cells. Cone cells contribute to colour discrimination. A foundational study by Neitz and colleagues used behavioural tests in dogs and found results consistent with two cone-pigment classes, rather than the three that support typical human trichromatic colour vision.

That is why dog vision is often compared with human red-green colour-vision deficiency. It is a broad explanation of differences in discrimination, not proof that a person can reproduce every detail of a dog's experience.

Dogs do not see only two coloured objects

“Blue and yellow vision” is a shorthand, not a claim that everything is painted in two flat colours. Objects still vary in brightness, shape, texture and position.

A red toy does not vanish because of its colour. Your dog may locate it by its outline, movement, smell or contrast against the ground. What may be less useful is expecting red and green to provide the same strong colour distinction that they provide to you.

Similarly, grey is not the only possible appearance of every colour outside the simplified blue-yellow description. Avoid taking a phone filter or online colour chart as a literal view through your dog's eyes.

Choose toys for the background where you use them

Blue and yellow are sensible options to consider, but there is no universally best toy colour for every room, surface and light level.

• On a lawn: consider a clearly contrasting toy rather than relying on red against green as the main distinction.
• On a patterned rug: a plain, larger visible outline may be easier to distinguish than a small patterned object.
• In a dim room: improve the lighting rather than assuming a bright human colour solves the problem.
• Among several toys: vary shape and texture as well as colour, particularly when teaching a choice.

These are practical applications of the visual differences, not guarantees about a particular dog. Watch what works in the setting where you actually play.

Make training signals clear in more than one way

If you use two target objects, do not make red versus green their only difference. Give the dog an achievable task with consistent placement and a clear reward for the behaviour you want.

When teaching a hand signal, use a visible position against an uncluttered background. Do not assume a dog ignoring a small gesture at a distance is refusing a cue they can clearly see.

Change one feature at a time when practising. Moving to a new room, reducing the light and swapping the target colour together makes it difficult to know which change affected the response.

Never use a colour-only cue as the sole protection around a hazard. Secure barriers, appropriate leads and direct supervision remain important regardless of a dog's ability to distinguish a marker.

Colour is only one part of vision

Recognising a colour, detecting movement and resolving fine detail are different visual tasks. A dog performing well at one does not establish that all the others are equally strong.

Dogs also have adaptations for dim-light vision, including rod cells and a reflective structure called the tapetum. Those adaptations do not create light in total darkness or mean that every obstacle is easy to see.

For owners, the useful response is modest: provide clear lighting and easy-to-see arrangements rather than trying to compensate for every visual difference with a new product.

Observe preferences without running a home vision test

You can notice which toys your dog finds readily during ordinary play, but that is not a clinical examination. A dog may choose an object because of its smell, texture, prior rewards or location rather than its colour.

A simple practical comparison is to offer a familiar toy in a clear, well-lit area and observe whether the setup is comfortable. Do not create obstacles, withhold rewards or move furniture to test how well your dog sees.

Normal canine colour vision is not a reason to dismiss a new difficulty navigating or locating familiar objects. Discuss a change in visual behaviour with your veterinarian rather than trying to diagnose it using coloured toys.

Common misconceptions

• Dogs see only black and white: normal dogs have colour discrimination.
• Red objects are invisible: colour is not the only cue that makes an object detectable.
• Every blue toy is easy to find: background, lighting and the individual task still matter.
• A colour filter shows exactly what a dog sees: it is an illustration, not a direct record of perception.
• Choosing one toy proves a vision problem: preference is influenced by many factors.

Frequently Asked Questions

Are dogs completely colourblind?

No. They have dichromatic colour vision, which differs from typical human colour vision.

What colour toy should I choose?

Blue or yellow can be useful options, but choose a suitable toy that contrasts with the background where you use it. Size, texture and safe construction also matter.

Can dogs see a red ball?

Yes, a red ball is not invisible. The dog may distinguish it through brightness, outline, movement or other cues even when its colour is less distinctive.

Should I replace everything red or green?

No. Focus on practical visibility where it matters. You can add contrast or use different shapes without replacing every coloured object.

Use colour as one helpful clue

Look at the background, improve lighting and make training cues clear. Understanding dog colour vision should make everyday choices simpler, without turning a normal species difference into a problem that requires a purchase.

Sources

• Neitz, Geist and Jacobs: colour vision in the dog
• University of Wisconsin-Madison: rod cells and dim-light vision

ASK A VET™ encourages practical care that recognises how dogs experience the world differently from people.